PURPOSE: To enable a locker to reduce a occupancy space when it is not used and to lock a door when baggage is housed.

CONSTITUTION: This locker is constituted in such a way that a left side plate 6 and a right side plate 7 are mounted on either one of a front plate 1 and a back plate 3 in such a way that they can be turned freely, and a part 8 to be guided by the guide parts 4 is provided on the other side of the front plate 1 and the back plate 3, and a stop board 9 and a bottom plate 11 are mounted on either one of the front plate 1 and the back plate 3 in such a way that they can be turned freely. Also, the locker is constituted so that projections 10, 20 to engage with the other sides of the front plate 1 and the back plate 3 when they are turned to prescribed positions are provided, and assembling can be performed by turning the left side plate 7, the right side plate 7, the top board 9, and the bottom plate 11 from a folded state, and a space part for housing can be formed. Also, it is constituted in such a way that a lock means switched so as to lock the door 2 based on the output of the baggage detecting means of the space part for housing is provided, and the lock means 23 can be operated by closing the door by housing the baggage to the space part for housing.