To make it possible to efficiently and stably carry out the task of permitting a plurality of vehicle to enter and leave a parking lot.

A mechanical parking lot control system executing operation control of a conveyance apparatus having at least an entry/leave gate, a lift device conveying vehicles between stories and parking chambers for parking the vehicle in a specified position on the entry/leave of the vehicles in a multistory parking lot having one or more parking chambers at every story comprises an entry/leave control means for executing control by accumulating execution reservation information for entry/leave requests corresponding to entry/leave request of the vehicles for entering/leaving the parking lot, a path generation means for generating a candidate path in the conveying device for every entry/leave request accumulated in the execution reservation information, a concurrence check means for checking whether the motion of the conveying device based on a path obtained by the path generating means interferes with the motion of the conveying device based on other entry/leave requests, and an execution control means for controlling the execution status based on the entry/leave request.