In order to enhance security, authentication for registered users logging in to the Mina Search and related websites will change to an email-based authentication system in June 2026.

Registering and Confirming Your Email Address to Receive Authentication Codes

Under the new authentication method, you will be required to enter a one-time authentication code sent to your registered email address in addition to your User ID and password to log in.

If you have not yet registered an email address, please log in to the Mina Search or a related website and register a valid email address before June 2026 so that you can receive authentication codes.

If you have already registered an email address, please verify that you currently receive email there. If it is no longer valid, please update it accordingly.

For detailed instructions, please refer to How to Register or Change Your Email Address.

Important Notes on Registering or Updating Your Email Address

• Please register an email address that you can access when using NDL websites. If you are unable to receive authentication codes, you will not be able to log in to the Mina Search and related websites.
• If you access the Mina Search while away from home or the office, we recommend registering an email address that you can access from your smartphone or similar device.
• Please ensure that your email settings allow you to receive messages from the ndl.go.jp domain.

Please note that you will not be able to reset your password via the Internet without registering a valid email address.

Login Procedure under the New Authentication Method

1. Enter your User ID and password on the login screen, and click the Log In button.

If you check the Keep Me Logged In checkbox and log in successfully, you will not need to log in each time.
Click the Log In button to display the Enter Authentication Code dialog.

2. Check the authentication code sent to your registered email address.
An email containing the authentication code will be sent to your registered email address from the ndl.go.jp domain. The six-digit number is the authentication code. Use your email software or application to read the mail and check the authentication code.

Please be aware that the email sent by the NDL to notify you of your authentication code does not contain any URLs. Please beware of phishing scams sent from scammers.
Please also be sure that appropriate security measures are in place for your email account.

3. 3. Enter the authentication code to log in.
Enter the six-digit authentication code shown under Authentication Code in the email you receive in the Enter Authentication Code dialog to complete your login.

Once you have completed a successful authentication, if you access an NDL website again within a short period of time and without any changes to your browser environment, you will not be required to enter another authentication code.

How to Register or Change Your Email Address (Before the Login Method Change)

1. Click the Login icon in the upper right corner of the Mina Search top page.
2. Enter your User ID and password in the dialog to log in.
3. Click the My Account icon in the upper right corner of the page to display the My Account page. My Account page will display your currently registered email address, if any, in the email address field. To register or change your email address, click the Review or Update User Information button at the bottom of the window.
4. Click the Change button to the right of the email address field.
5. Enter your new email address in the New Email Address field that appears, and click the Update button at the bottom of the window.
6. A confirmation email will be sent to the email address you entered. Please click the URL to confirm email address update in the email within 10 minutes.