In a lawn mower for mowing lawns on a ground having a drive shaft (20a) adapted to transmit a rotational driving force of a operating motor (20), three blades (16) and a connecting member (80) having a blade disk (82) adapted to connect the blades with the drive shaft, a fan (82d) is integrally formed at the connecting member. The blades are attached to the connecting member at a circumference of the connecting member and to be movable relative to the connecting member in a radial direction of the connecting member.
