MONITORING DEVICE, MONITORING METHOD, AND NON-TRANSITORY COMPUTER-READABLE MEDIUM STORING PROGRAM

A monitoring device that performs monitoring of an occupant of a vehicle by at least one monitoring mode from out of a first monitoring mode or a second monitoring mode that is different from the first monitoring mode. The monitoring device includes a setting section that sets a monitoring mode for monitoring the occupant based on a detection result of part of a body of the occupant using at least one monitoring mode from out of the first monitoring mode or the second monitoring mode.