A lock device locks a locking subject to a power port. The lock device is provided with a lock mechanism including a lock member that is movable between a lock position and an unlock position. The lock mechanism moves the lock member to the lock position to lock the locking subject and moves the lock member to the unlock position to unlock the locking subject. A location registration unit registers, as a registered location, a location where switching of the locking subject between a lock state and an unlock state is prohibited or permitted. A location acquisition unit acquires a present location of the lock device. A switching control unit compares the present location with the registered location and controls the lock mechanism based on the comparison to switch the locking subject between the lock state and the unlock state.