a vehicle body supported by a plurality of wheels;

a driver's seat supported by the vehicle body;

an engine mounted to the vehicle body at a position rearwardly of the driver's seat;

a mower suspended from the vehicle body;

at least one grass collector bag for collecting grass cut by the mower;

a grass collector bag holder supporting said at least one grass collector bag such that at least a part of the at least one grass collector bag overlaps with the engine in a side view;

a stopper portion that is bar-shaped in both the side view and a rear view, said bar-shaped stopper portion being located at such a position that the bar-shaped stopper portion overlaps with a lower rearward region of the grass collector bag in a side view for abutting against the grass collector bag on the lower rearward region of the grass collector bag so as to prevent the grass collector bag supported by the grass collector bag holder from moving laterally toward the vehicle body;

wherein the grass collector bag holder comprises a first support bar arranged laterally between said at least one grass collector bag and the vehicle body and the bar-shaped stopper portion is provided in the first support bar;

wherein the grass collector bag holder supports the grass collector bag such that the grass collector bag is suspended at a position to the side of a rear end portion located behind the rear wheels of the vehicle body;

wherein the first support bar is a bent support bar comprising a longitudinal support bar portion extending in the vehicle body's longitudinal direction, and a vertical support bar portion extending vertically in the vehicle body's vertical direction from a rear end of the longitudinal support bar portion; and

wherein the bar-shaped stopper portion is the rear end portion of the longitudinal support bar portion, and the rear end portion of the longitudinal support bar portion protrudes rearwardly of the vehicle body.