An emergency reporting system for a vehicle includes a reporting signal verifying device and a power supply switching device. The reporting signal verifying device verifies a reporting signal, and the reporting signal verifying device is adapted to cause the emergency reporting to an outside emergency agency when the reporting signal verifying device has completed the verification. The power supply switching device switches power supply for the emergency reporting from a main power supply of the vehicle to an auxiliary power supply in a case, where the main power supply is disabled to supply power. The power supply switching device is adapted to switch the power supply from the main power supply to the auxiliary power supply in a period between (a) a point when the reporting signal verifying device starts the verification and (b) a point when the reporting signal verifying device completes the verification.