To simplify a structure such as a lock provided for an opening/closing door of a locker and enhance the function of the locker.

This lock device is provided with a lock box 2 disposed in the opening/closing door 41 constituting the locker, a window hole part 3 formed in the lock box 2 in such a manner as to penetrate the two sides of the door 41 in a thickness direction, a holding part 7 located at the hole part 3 in the backside of the door 41 in order to house and hold a card 43, part of which can be seen from the surface of the door 41 through the hole part 3, a handgrip part 5 formed in part of the inner peripheral edge of the hole part 3, and a lock part 12, which is located for disposition at the peripheral edge of the hole part 3 in the surface 2a of the lock box 2 and operated with a key 45 for the purpose of allowing a latch 17 to advance/retreat.