Working Vehicle with Tilt Floor

In a working vehicle having a tilt floor (7), the tilt floor can easily be tilted up and down. Maintenance around an engine can excellently be carried out. A torsion bar (9), which has one end mounted on the tilt floor and the other end thereof mounted on a base frame, 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. A neutral position of the torsion bar is between the closed position and the maximally opened position.