A mower comprising a housing and a cover (4) pivotally connected to the housing. The housing comprises a grass discharging opening (3). The cover selectively opens or covers the grass discharging opening. In a first state, a free end (41) of the cover is away from the grass discharging opening, the grass discharging opening being opened. In a third state, the cover is disposed inside an outer contour of the housing, at least part of the cover covering the grass discharging opening. At least one side of the housing opposing the grass discharging opening is provided with a position-limiting part (13). The position-limiting part limits a second width (W2) of a pivotal rotation path of the cover. The second width is less than a width (W0) of the cover. The mower has a second state in which the cover presses against the top of the position-limiting part. The cover has a temporary width, the temporary width being less than the second width. The mower can meet the requirements for grass discharging operation with or without a grass collection box and also reduces space occupied by the mower when in storage.
