To provide a pallet loading and unloading device capable of reducing the longitudinal dimension of a connecting frame and easily ensuring an installation space.

The pallet loading and unloading device 1 is equipped with right and left side frames 5 which are mutually separated and opposed through a pallet storage space part 4. The rear end parts of the right and left side frames are mutually connected with a connecting frame 6. A lifting body 11 is liftably provided on the right and left side frames respectively. Motors 12 for lifting which lifts the lifting body 11 are liftably provided at the right and left side frames respectively. The lifting body 11 is provided with a pallet support body 31 which becomes in an advancing state advancing in the pallet storage space part 4 and a retreated state retreated from the pallet storage space part 4.