In a utility vehicle, equipped with a lawnmower work unit (20) having a circular single blade disk (20a) rotatable around a rotating shaft connected to an output shaft of a work motor (prime mover) mounted on a chassis, and multiple (three) blades attached to circumference of the blade disk 20a at equally spaced apart positions, a single second disk (80) is fixed to middle of the surface of the blade disk (20a) of the lawnmower work unit (20) at positions that are spaced apart from each other.
