To suppress the deformation and damages of a support frame and to improve the durability of the support frame by reducing loads to act on the support frame when a traveling vehicle is operated.

A support frame 20 includes front and back columns 21 erected on a center beam 10 and a beam 22 disposed over the upper end parts of the columns. In the support frame 20, the beam 22 is divided in the middle into division beams 22a and 22b, and both the division beams 22a and 22b are connected by an elastic connection member 24 having an elastic member 24a. The connection position is not at equal distances from connection parts to the columns 21, the lengths of the division beams 22a and 22b are different, and the support frame 20 is asymmetrical to the front and back with the position of the elastic connection member 24 at the center.