1. A biometric authentication device comprising: a memory; and a processor coupled to the memory and the processor configured to execute a process, the process comprising: extracting a finger crotch from a palm image for comparison; based on an asperity shape of a palm outline extracted from the palm image and a regularity of palm surface information extracted from the palm image, extracting a finger root wrinkle from the palm image for comparison, the surface information being extracted by applying an edge extraction filter; adjusting at least one of a position of a biometric feature for comparison of the palm image for comparison and a position of an enrollment biometric feature of an enrolled palm image, based on position information of the finger crotch extracted in the extracting of the finger crotch and position information of the wrinkle extracted in the extracting of the finger root wrinkle; and comparing the biometric feature for comparison and the enrollment biometric feature after the adjusting.