DETERMINATION DEVICE, DETERMINATION METHOD, AND PROGRAM

To effectively increase determination accuracy for road rage, provided is a determination device (1) including: a close state determination unit (12) configured to determine whether a first vehicle (V1) and a second vehicle (V2) are in a predetermined close state; a third vehicle determination unit (11) configured to determine whether a third vehicle (V3) traveling in front of the second vehicle (V2) exists; and a road rage determination unit (16) configured to avoid determining that the road rage is being executed when at least one condition of a first condition that the close state determination unit (12) determines that the close state exists and a second condition that the third vehicle determination unit (11) determines that the third vehicle (V3) does not exist is not satisfied, and to determine that the road rage is being executed when the first condition and the second condition are satisfied.