An electronic key system is provided with: an electronic key issuing apparatus configured to issue an electronic key associated with a moving body; a determinator configured to determine whether or not an electronic key with a first key code as the electronic key is normal; and a requester configured to request the electronic key issuing apparatus to reissue the electronic key on condition that it is determined by the determinator that the electronic key with the first key code is not normal. The electronic key issuing apparatus is configured to issue an electronic key with a second key code, which is different from the first key code, as the electronic key, on condition that the electronic key issuing apparatus is requested to reissue the electronic key.