To solve the problem of a travel transmission device formed by combining a hydraulic transmission device and a planetary gear mechanism, that the steering operation is simple and effective, but it is difficult to assemble an automatic direction controller because of the absence of a side clutch when it is utilized as a combine.

In this travel transmission device for a moving agricultural machine, the rotary motive power from a hydraulic transmission 4 for traveling is distributed to left and right planetary gear mechanisms 7, 7' transmittably connected to wheel shaft 2, 2' to be transmitted to the wheel shafts 2, 2', and the rotary motive power of mutually opposite directions is distributed to the same from a hydraulic transmission 5 for revolving. Side clutches 9, 9' are mounted on the transmission parts 8, 8' from the planetary gear mechanisms 7, 7' to traveling crawlers 3, 3' of the wheel shafts 2, 2'.