DETERIORATION DEGREE DETERMINATION DEVICE

A deterioration degree determining apparatus configured to determine a deterioration degree of a battery of a vehicle is disclosed that includes an electric component activating part which activates a non-driving series electric component of the vehicle by using electric power of the battery in order to determine the deterioration degree of the battery, a charge degree obtaining part which obtains a charge degree of the battery during a period of time in which a charge state of the battery is increased to a designated degree by charging the battery after the battery is discharged for a designated period of time by causing the electric component activating part to activate the non-driving series electric component, the battery being charged by electric power generated by an electric generator of the vehicle; and a deterioration degree determining part which determines the deterioration degree of the battery based on the charge degree obtained by the charge degree obtaining part.