In a utility vehicle, equipped with a lawnmower work unit having a circular single blade disk 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 a circumference of the blade disk at equally spaced apart positions, a single second disk is fixed to a middle of the surface of the blade disk of the lawnmower work unit at fixing positions that are spaced apart from each other.
