A reporting system has a first handheld device that locks and unlocks a door of a vehicle, and a second handheld device that communicates with the first handheld device. The first handheld device has an inside/outside determination unit that carries out wireless communication with the vehicle and acquires, with the vehicle, information of inside/outside determination on whether the first handheld device is inside the vehicle or outside the vehicle, and a transmitting unit that transmits the result of the inside/outside determination. The second handheld device has a receiving unit that receives the result of the determination from the first handheld device.