A lawn mower (10) includes a cutter blade (15) having flaps (38) and a flap drive mechanism (54). The flap drive mechanism (54) includes a flap drive source (56) and an intermediate power transmission unit (59). The intermediate power transmission unit (59) is provided on a power transmission path between the flap drive source (56) and the flaps (38) and provided coaxially with a blade rotation axis (a1). An output axis (16a) of a motor (16) is provided coaxially with a blade rotation axis (a1) and the intermediate power transmission unit (59).
