To solve the problem wherein when feeding fuel in a fuel tank, the fuel erroneously drops from the filling opening, drops from the upper surface of the outside of the fuel tank along the flange part, and splashes onto a high-temperature muffler in a walking type mobile agricultural machine such as a walking type management machine equipped with the fuel tank above an engine mounted to the machine body.

The shield members 25, 21d combining with a heat-shield means for the muffler 24 and a fuel drop prevention means for the muffler 24 during filling the fuel are extended to the flange part 21c of the fuel tank 21 at the side where the muffler 24 is provided. Even the fuel erroneously drops from the filling opening 21a when feeding the fuel into the fuel tank 21, the dropped fuel comes down from the fuel tank 21 along the shield members 25, 21d and drops without splashing onto the high-temperature muffler 24.