According to the present invention, since the central part of the front wall portion, with which the grass clippings collide, has a small radius of curvature, {HEAD ~ the grass clippings} are diverted by {TAIL ~ the central part} having the small radius of curvature so as to flow along the right and left arcuate portions 
are diverted by
According to the present invention , since the central part of the front wall portion , with which the grass clippings collide , has a small radius of curvature , { HEAD ~ the grass clippings } are diverted by { TAIL ~ the central part } having the small radius of curvature so as to flow along the right and left arcuate portions
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