Patent ID: 8542095

Claim:
A biometric authentication device comprising: a signal pattern generating unit that generates a signal pattern of a signal transmitted to a living body; a signal transmitting unit that transmits a signal to the living body based on the signal pattern from the signal pattern generating unit; a signal receiving unit that receives a response signal transmitted from the living body, the received response signal being in response to the transmitted signal that is based on the generated signal pattern; a transfer feature calculating unit that calculates a transfer feature of a signal transmitted through the living body based on the signal pattern from the signal pattern generating unit and the response signal received by the signal receiving unit; a feature amount extracting unit that extracts a feature amount based on the transfer feature that is calculated, the feature amount varying for every living body; and a feature amount collating unit that collates the extracted feature amount with a feature amount stored in a feature amount storing unit in advance, wherein the signal pattern generating unit is configured to change the signal pattern every time the signal pattern generating unit generates the signal pattern.