A traveling vehicle, wherein a power transmission system for traveling straight forward, a power transmission system for turning, a power transmission system for PTO, and a power transmission system for driving a pump are disposed in a transmission part integrally with each other and a transmission device for traveling straight forward and a continuously variable transmission device for turning are interlockingly installed in the transmission part continuously with each other in a parallel state, whereby the transmission systems can be compactly disposed in the transmission part, and all of the power transmission system for traveling straight forward, the power transmission system for turning, the power transmission system for PTO, and the power transmission system for driving the pump can be easily assembled by merely installing the transmission part on a body frame.