In a working vehicle having a tilt floor, a torsion bar has one end mounted on the tilt floor and the other end thereof mounted on a base frame, and is disposed on the tilt floor which is tilted up and down relative to the base frame. In a maximally opened position where the tilt floor is tilted up and a closed position where the tilt floor is tilted down, a position of a barycenter (G) of the tilt floor on which the driving room (C) is disposed is opposite from each other relative to a turning center of the tilt floor across the top dead center.