Provided is a vehicle abnormality detecting device including an abnormality detecting unit 70A for detecting abnormality on the basis of a state of current supply to a state detecting unit 30, and a power supply control unit 11 for switching a state of power supply to the state detecting unit 30 when the abnormality was detected by the abnormality detecting unit 70A, so that power consumption at the time of detecting the abnormality is suppressed to avoid the battery consumption.