To provide a traveling truck capable of attaining the light weight, cost reduction and miniaturization of a traveling drive unit in a conveying system in a clean room.

The traveling truck is provided with the traveling drive unit comprising a motor 1; a reduction gear 2 coaxially and directly connected to an output shaft 1a of the motor 1; and a wheel 3 coaxially and directly connected to an output shaft 2a of the reduction gear 2. Further, the output shaft 1a of the motor 1 and the reduction gear 2 are stored in the wheel 3, and the motor 1 is further arranged at the inner side of a frame 7 of the traveling truck 10 attached with the traveling drive unit 5.