To prevent a malfunction of locking or unlocking and to reduce the power consumption of a receiving unit side that receives an unlock signal in a lock system which unlocks a lock by the unlock signal.

The lock system avoids radio wave interference of the unlock signal and prevents malfunction of locking or unlocking by providing irregularity in the transmission timing of the unlock signal to a device that unlocks a lock by the unlock signal. In regard to the reception of the unlock signal, the lock system sets a receiving window by setting a reception-on time and a reception-off time, and by stopping an operation of the receiving unit except during the reception-on time, the reduction of power consumption can be achieved.

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