To provide a multistory parking device capable of securing proper operation even in a rough environment of easily causing the bite-in of refuse for enabling long-term use in a state of applying a high load, while surely transmitting a large driving force required for teeth of a pinion and a rack used for a synchronizer of the multistory parking device.

This multistory parking device has a lifting pallet 1, a lifting driving mechanism having two sliders 3 attached with the lifting pallet and a hydraulic cylinder 2 installed on one or both of the two sliders, and the synchronizer rotatably journaled between both sliders and composed of a synchronizing shaft 4 of fixing the pinion 7 at its both ends parts and the rack 5 installed on a column 6. A tooth shape of the pinion and the rack fixed to both ends of the synchronizing shaft used for the synchronizer formed of a continuous fixed-rate circle of unchangeable in a radius.