A lawn mower (1) contains: a work unit (5) including a housing (21) having a downward-facing opening and a cutter blade (22) rotatably provided in the housing (21) such that when rotated, the cutter blade (22) cuts grass and generates a transport air flow flowing from the opening of the housing (21) to inside； a grass clippings receptacle (6) configured to receive grass clippings cut by the work unit (5)； a grass clippings transport passage (38) connecting an interior of the housing (21) with the grass clippings receptacle (6)； a shutter device (40) including a shutter (41) configured to selectively open and close the grass clippings transport passage (38) and an actuator (42) configured to drive the shutter (41)； a controller (50) configured to control the shutter device (40)； and a pressure sensor (65) provided in the grass clippings transport passage (38) to detect a pressure in the grass clippings transport passage (38), wherein the controller (50) is configured to control the shutter device (40) in accordance with the pressure detected by the pressure sensor (65).
