To stabilize an action so as to prevent contact with a heavy machine and the like in a treadplate for a vehicle carrier.

A treadplate 1 pivoted to the rear part of a vehicle body 2 is provided with a front treadplate 11 and a rear treadplate 12. When a derricking cylinder 5 is extended/shrunk, the treadplate 1 is raised/lowered via a derricking link 4 according to the rotation of a main rotary shaft 3. The front treadplate 11 and the rear treadplate 12 are connected together by means of a front link, a rear link, and a pin 17. When an opening/closing cylinder 18 pivoted in the front treadplate 11 is extended/shrunk, the front link 15 and the rear link 16 are rotated relatively around the pin 17, and on the basis of this rotation, a folded/unfolded condition of the front treadplate 11 and the rear treadplate 12 can be selected.