MOWER

A mower including a mower unit (8); a grass collector (10) configured to store mown grass; a guide duct extending from the mower unit (8) to the grass collector (10) and configured to guide grass mown by the mower unit (8) to the grass collector (10); and a fullness detector (20) configured to detect that the grass collector (10) has become full of mown grass, the fullness detector (20) including: a receiver (21) configured to be pressed toward a first side by mown grass in contact with the receiver (21); an urging member (22) urging the receiver (21) toward a second side opposite to the first side; a weight (23) to adjust a swing sensitivity of the receiver (21) to a press by mown grass; and a detection sensor (24) configured to detect that the receiver (21) has been pressed by mown grass.