bitFlyer

口座開設の手順

How to open an account

Source: official guide ↗

1. 1

   Register your email

   Register your email via "Create account" in the bitFlyer app (or on the website). A confirmation email arrives.

   1. Install and open the bitFlyer app and tap 「アカウント作成」 (Create account); on a computer you can do the same on the bitFlyer website. Use an email address only you use: shared addresses (such as a family address) are not accepted, and each person may have only one account.
   2. After you enter your address, bitFlyer sends an account-registration confirmation email. On the website, copy the 【キーワード】 (keyword) from the email into the dialog on screen and press 「アカウント作成」 again. In the app, complete the confirmation as the screen and the email tell you.
   3. If the email doesn't show up, check your spam and other sorted folders, allow mail from @bitflyer.com and @bitflyer.jp, and try again.
   4. You can't trade yet. Next you set a password and 2-step verification and accept the terms. bitFlyer says the whole sign-up can take as little as 9 minutes when everything goes smoothly (its own figure for Jul 2025–Jun 2026).

   Tip If nothing arrives, check your spam folder and make sure mail from @bitflyer.com and @bitflyer.jp is allowed.

   Source: official guide ↗
2. 2

   Set a password and 2-step verification, then accept the terms

   Set a login password and 2-step verification, then read and accept the terms of use, privacy policy, crypto risk explanation and pre-contract document.

   1. Choose a login password of 9–100 characters mixing at least two of lowercase letters, capitals, numbers and symbols. Common strings such as "password" or "123456789" are rejected. Don't reuse a password from any other service.
   2. Pick a 2-step verification method: SMS to your mobile, an authenticator app (such as Google Authenticator) or email. bitFlyer recommends SMS or an app, because email codes can be intercepted if your mailbox is hacked.
   3. With SMS, type the code you receive and press 「二段階認証を設定する」. With an authenticator app, scan the on-screen QR code (or type the key by hand) and enter the number the app shows. If SMS never arrives, you can receive the code by voice call instead.
   4. If you choose email, you must also set a 4-digit PIN. Registering an external address, withdrawing yen and sending crypto out always require 2-step verification, which can't be switched off. Verification at login is optional but worth turning on.
   5. Read the four documents: terms of use, privacy policy, crypto trading risks and the pre-contract document for spot trading. Only if you agree and are not a US resident, tick all four boxes and press 「bitFlyer をはじめる」. US residents cannot open an account.

   Tip You can only tick the consent boxes if you are not a US resident.

   Source: official guide ↗
3. 3

   Enter your details and answer the questionnaire

   Enter your name, gender, date of birth and address exactly as on your ID, then answer questions on occupation, income, financial assets, purpose and experience.

   1. Open 「ご本人情報のご登録」 (register your details) and enter your name, gender, date of birth, address and so on, written exactly as on the ID you will submit, including kanji variants (such as 髙 vs 高) and the spelling of any roman letters.
   2. Type the full address down to block number, building name and room number. Missing parts, or differences from your ID, can stop the ID check from completing. If you have moved and your ID still shows the old address, update the ID first.
   3. Then complete 「お客様の取引目的等の確認」 (purpose of trading and related questions): whether you are a foreign politically exposed person (PEP), occupation, annual income, financial assets, purpose, investment experience, how you came to bitFlyer, and whether you are an insider.
   4. Answer everything truthfully. bitFlyer checks your answers against its trading criteria to decide which services you can use. If you only want to buy and sell coins, you don't need a leverage-related purpose. Overstating anything gives no advantage.
   5. If you tick "I am a foreign PEP or a relative of one" by mistake, ask bitFlyer to correct it through the contact form or the phone line. See "Application questions explained" below for what each question means.
   6. You can review your answers later under 「設定」 → 「お客様の取引目的等の確認」 → 「変更依頼をする」 (in the app, via 「マイアカウント」 → 「ご登録内容」). Update them there whenever your job or income changes.

   Tip Missing block numbers, building names or room numbers, or different kanji forms, can stop the ID check from completing. See "Application questions explained" below for what each question means.

   Source: official guide ↗
4. 4

   File the tax-residence form (CARF)

   During the ID procedure you declare your country of tax residence and related details. It is mandatory for accounts opened from 1 Jan 2026; without it you can't go on to submit your ID.

   1. During the ID procedure you are asked to file the 「実特法に基づく届出書」, a tax-residence declaration under the CARF rules. Everyone opening an account from 1 Jan 2026 must file it, and you can't move on to submitting your ID until you do.
   2. You declare your country (or countries) of tax residence, meaning where you are liable to pay income tax. If you live in Japan and only pay tax in Japan, the answer is Japan.
   3. If you also owe tax elsewhere (for example, a US citizen living in Japan), declare that country too and fill in the extra details the screen asks for. If you are unsure of your tax residence, check with the tax office or a tax accountant before filing.
   4. For people resident abroad, details such as name, address, date of birth and trading information are reported to Japan's tax authority and shared with other countries' tax authorities.
   5. If you couldn't file it during sign-up, you can submit it later from the filing page after logging in, but your ID check won't complete until it's filed. You can correct the filing later if something was wrong.

   Source: official guide ↗
5. 5

   Submit your ID

   Recommended: Quick ID check. Photograph your driver's licence, My Number card or residence card, plus your face, with your phone. Without a smartphone, choose the in-person check: a letter is usually sent by Sagawa within 1–2 business days, and you show your ID to the courier when you receive it.

   1. Choose a method. With a smartphone, 「クイック本人確認」 (Quick ID check) is recommended: you photograph your ID and your face and everything is done online. Without a smartphone, choose 「対面での本人確認」 (in-person check), where you show your ID to a Sagawa courier.
   2. Quick ID check accepts one of: a driver's licence, a My Number card (the paper notification card is not accepted) or a valid residence card. If the address on the document isn't your current address, update it first.
   3. Follow the prompts to take photos and a short video of the document and your face. If you get an error saying the camera couldn't start, allow camera access for the Chrome app (not the bitFlyer app) in your phone's settings, and don't open the page in more than one browser.
   4. With the in-person check, a letter is usually shipped within 1–2 business days. When it arrives you show your ID to the courier, and if it matches your registered details you receive the letter. Accepted IDs: a driver's licence, a My Number card (taken out of its case) or a Japanese passport.
   5. Passports issued from 4 Feb 2020 have no address field, so also prepare an original document from the last 6 months showing your current address: a tax certificate, a social insurance or national pension receipt, or an electricity, gas or water bill.
   6. The letter can only be received at the address you applied with: no forwarding or depot pick-up. If you miss it, book redelivery from the notice slip; after 7 days from the first attempt you have to apply again. The in-person check isn't available in some mountain and remote-island areas Sagawa can't reach.

   Tip Passports work for the in-person check, but those issued from 4 Feb 2020 (no address field) need an extra document from the last 6 months showing your address, such as a utility bill. The paper My Number notification card is not accepted.

   Source: official guide ↗
6. 6

   Enter your name in roman letters

   After submitting your ID, you're asked for your name in roman letters. Check it and register.

   1. Once your ID is submitted, you are asked to update your details with your name in roman letters.
   2. Type your family name and given name in roman letters, and check for typos or a swapped family and given name.
   3. Check what you typed and tap 「登録する」. That completes your part of the application; now bitFlyer reviews it.
7. 7

   Approval, then start trading

   With Quick ID check, review can finish the same day. With the in-person check, you can trade once bitFlyer approves you after the letter is delivered.

   1. With Quick ID check, if your registered details match your document, review can finish the same day. bitFlyer says accounts have opened in as little as 9 minutes when everything goes smoothly.
   2. With the in-person check, you can trade once bitFlyer approves you after the letter is delivered, so it takes longer than Quick ID check because of shipping and delivery.
   3. Your questionnaire answers are judged against the trading criteria, which decides what you can use. If you are judged not to meet them for spot trading, new purchases on the sales desk, Easy Exchange and Lightning Spot are blocked (selling remains possible).
   4. If you notice a mistake in your registered details, or your situation changes, request a correction from settings; bitFlyer then reviews them again.
   5. Once approved you can start trading. Starting with a small amount on the sales desk is a sensible first step. It charges no trading fee, but the gap between the buy and sell prices (the spread) is the real cost.
8. 8

   Register a bank account and deposit yen

   Register a bank account in your own name, then transfer to your personal deposit account shown on the deposit screen (choose SMBC, docomo SMTB Net Bank or GMO Aozora Net Bank). Quick deposits via online banking and convenience-store deposits are also available.

   1. Before depositing you must register a bank account in your own name: in the app menu go to 「マイアカウント」 → 「銀行口座情報確認」 → 「本人銀行口座を登録」 and enter the details (up to 4 accounts).
   2. bitFlyer checks the account. If the name and number are right this takes from the same day to the next business day, though it can take 2–3 days. Yen can only be withdrawn to registered accounts.
   3. To pay by bank transfer, open 「入出金」 → 「入金・受取」 → 「日本円」 → 「銀行振込」 to see your personal deposit account at SMBC, docomo SMTB Net Bank or GMO Aozora Net Bank (your choice). The account number is unique to you.
   4. Always transfer from an account in your own name; a different name isn't credited and you pay the fee to have it returned. For docomo SMTB Net Bank, put your assigned 5-digit number before your name as the sender (e.g. 12345 ﾔﾏﾀﾞ ﾀﾛｳ); leaving it out can stop the deposit being credited.
   5. Transfers are credited by the next business day at the latest. Deposits to the SMBC or GMO Aozora account can be made around the clock from banks on the Zengin More Time system. You pay the bank fee, although bitFlyer says transfers from SMBC, docomo SMTB and GMO Aozora are free. Bank transfers have no upper limit.
   6. 「クイック入金」 (online banking, convenience stores or Pay-easy ATMs) is credited instantly around the clock but costs ¥330 per deposit (free from docomo SMTB). Except via docomo SMTB, assets equal to a quick deposit can't be withdrawn or sent out for 7 days. Convenience-store payments are capped at ¥300,000 each.
   7. From 15 Oct 2026 a "cooldown" applies in your first 90 days after ID approval: for 48 hours after a yen deposit, crypto worth the yen deposited in that window minus ¥100,000 can't be sent to outside addresses. Trading and yen deposits and withdrawals are unaffected.
   8. Once the yen arrives you can buy on the sales desk: choose a coin, tap 「買う」, enter an amount and tap 「買い注文に進む」. The purchase is done when 「注文完了」 appears.

   Tip Transfer from an account in your own name, or the deposit may not be credited. For docomo SMTB Net Bank, put your assigned 5-digit number in front of your name as the sender (leaving it out can stop the deposit being credited).

   Source: official guide ↗

申込フォームの質問と答え方

Application questions explained

What each question means and how to answer it accurately. Always answer truthfully. Answers that don't match reality lead to rejection or a frozen account.

スムーズに開設するコツ

Tips for a smooth signup

• Start with a few hundred yen on the sales desk, then buy BTC on the "Easy Exchange" order book (0.01–0.15% fee, minimum order 0.001 BTC) once comfortable. The sales desk has no fee, but the spread is the real cost.
• Bank transfer is the default way to deposit. bitFlyer says transfers from SMBC, docomo SMTB Net Bank and GMO Aozora Net Bank are free (quick and convenience-store deposits cost ¥330, except free quick deposits from docomo SMTB).
• If you're unsure about anything, call the support line on weekdays 9:30–17:30 (03-6434-5864).
• bitFlyer never asks you to send crypto. If someone on social media, a dating app or an investment group asks you to, assume it's a scam.
• From 1 Apr 2027, online account opening is due to rely mainly on IC-chip reading. bitFlyer's Quick ID check currently uses photos of your ID and face, so the procedure may change.