A locking/unlocking system includes: a power reception device having a vehicle coil provided in a vehicle and receiving power at a first frequency in a non-contact manner from a ground coil provided on the ground; an operation switch outputting an operation signal in response to a user operation; a locking/unlocking controller that, in response to an input of an operation signal, conducts wireless communication with a key device located within a predetermined distance at a second frequency close to the first frequency and that, in response to successful wireless communication with the key device, locks/unlocks a lock provided in the vehicle; a signal determining part that outputs an input operation signal to the locking/unlocking controller; and a wiring switch that connects wiring so that the operation signal output from the operation switch is input into the signal determining part during a power reception operation of the power reception device.