To realize miniaturization, and low-floor and low-center-of-gravity design.

Controllers 5, 7 which control motors 10-1, 10-2 and 12-1, 12-2 for propelling all wheels 2, 3 for a forklift 1 controls the driving states of all the wheels 2, 3 of the forklift 1. The controllers 5, 7 reduce an operating range requiring field-weakening control. As a result, modules 4, 6 can make effective use of a magnetic motor, thus attaining miniaturization. The forklift 1 can be structured so as to be developed into low-floor and low-center-of-gravity design with the modules 4, 6 disposed under a floor 9.