To provide a pallet carrying-in-and-out device capable of shortening a pallet replacement time by carrying out synchronously and simultaneously an empty pallet carrying-out operation from a bulk depalletizer and a loaded pallet carrying-in operation.

A pallet carrying-in-and-out device 23 in the state that empty pallets after the bulk disassembly in a bulk depalletizer are placed on the device is provided with an empty pallet carrying-out section 51 for carrying out the empty pallets to the outside of the bulk depalletizer and a bulk carrying-in section 50 for carrying-in pallets P on which bulk is placed into the depalletizer in synchronization with the carrying-out operation of the empty pallets Po of the empty pallet carrying-out section 51. The empty pallets Po are carried outside the machine by an empty carrying-out device 24, and the pallets P are lifted by a lifting and lowering table 10. A driving source for both sections 50 and 51 is a common driving motor.