A biometric authentication method causes a processor of a biometric authentication device to execute a process. The process may include: receiving user identification information and sensor type information from a terminal; confirming whether or not the received sensor type information has a predetermined relationship with a registered sensor type information corresponding to the received user identification that is among sensor type information of biometric sensors that have acquired biometric data registered for respective user identification information; and controlling, based on the confirmed sensor type information having the predetermined relationship, the issuance of a password to be used to re-register biometric data.