To prevent a lock from being illicitly unlocked from outside a room.

An electric lock system 1 comprises: an information detection section 11 which detects presence or absence of authentication information of a locking/unlocking key 3B coming close to a door 2 from outside a room; a key operation detection section 12 which detects the presence or the absence of a key operation to insert and turn a key 3A in a key hole 5a of an exterior side cylinder lock 5; a human body detection section 13 which detects the presence or the absence of a human body, inside the room, coming close to the door 2; and an electric lock control section 15 which performs unlocking control of a locking/unlocking mechanism 16 only when a human body detection signal from the human body detection section 13 is input with the authentication information as well as the key operation undetected respectively by the information detection section 11 and the key operation detection section 12.