There is provided a lawn mower where mowed grass 89 can be simply discharged from a mower device 16 to the inside of a grass collector 30, turnover of a traveling body 1 can be simply prevented, and the mowed grass 89 in the grass collector 30 can be simply discharged to a container 90 etc.The lawn mower comprises the mower device 16 mounted on the traveling body 1 provided with right and left rear wheels 6, the grass collector 30 for collecting the grass mowed by the mower device 16, a discharge duct 29 for discharging the mowed grass from the mower device 16 to an inside of the grass collector 30, and a lift mechanism 31 having right and left fixed masts 45 for supporting on the traveling body 1 the grass collector 30 to be lifted up and down.The grass collector 30 is lifted by the lift mechanism 31 to discharge the mowed grass 89 in the grass collector 30.The lift mechanism 31 is disposed within a width in the right and left directions of the grass collector 31, the discharge duct 29 is disposed between the right and left fixed masts 45, and the discharge duct 29 and the grass collector 30 are connected through between the right and left fixed masts 45.
