CONVEYANCE ROUTE DESIGN DEVICE, CONVEYANCE ROUTE DESIGN METHOD, AND A RECORDING MEDIUM

A conveyance route design device is capable of reducing costs while maintaining object conveyance efficiency. The determination unit determines an improvement target place that satisfies criteria for changing a current conveyance device to a conveyance device of lower conveyance capacity than the current conveyance device, for a plurality of conveyance routes. The assignment unit assigns the conveyance device of lower conveyance capacity to an improvement candidate route which is a conveyance route including the improvement target place.