To properly complete an emergency notification operation to the last procedure without requiring any exclusive auxiliary battery.

When an emergency notification operation is started, and then the emergency notification operation is interrupted according to the temporary deterioration of the voltage level of a battery voltage from a predetermined level or more to less than a predetermined level, on-vehicle emergency notification equipment 1 resumes the emergency notification operation when the voltage level of the battery voltage is restored from less than the predetermined level to the predetermined level or more. Thus, it is possible to properly complete the emergency notification operation for transmitting an emergency notification signal to a service center 10 to the last procedure without requiring any exclusive auxiliary battery.