To prevent concentrated load from being applied to a truck frame so as to reduce the weight of the truck frame.

In a crawler travel device with a lateral pair of equalizers provided at the front and rear parts of a truck frame 12 with respect to a centroidal position of a body, a connecting part of a front swing arm 26F is provided between a first rolling wheel 44 and a fulcrum of the front equalizer 37, and a connecting member of a rear swing arm 26R is provided between a fulcrum of the rear equalizer 38 and a final rolling wheel 45. The truck frame 12 is formed in U-shape from the front sectional view, and the connecting part of the front swing arm 26F, the connecting part of the rear swing arm 26R and a fulcrum part of a tension rolling wheel 39 are bulged and integrally constituted.