To inhibit influences on communication of an electronic key system in a non contact charger.

An interference suppression part 43 inhibits an AC current supplied to a primary coil L1 when detecting the AC current supplied to an LF antenna 23a. This structure inhibits the communication between an electronic key 10 and an on-vehicle device 20 from being interrupted by power transmission of a non contact charger 40 to a portable terminal 50.