PROBLEM TO BE SOLVED: To provide a riding lawn mower wherein the accumulation of grass clippings on the upper surface of the cutter deck and around the transmission section is reduced, and the state of accumulation of grass clippings is readily confirmed.SOLUTION: The riding lawn mower 10 includes a vehicle body 11 equipped with left and right front wheels 12L and 12R and left and right rear wheels 13L and 13R, a cutter deck 20 being elevatably disposed in a central lower section of the vehicle body and having an open lower surface, cutter blades accommodated inside the cutter deck, and a transmission section 50 being disposed in proximity to an upper surface of the cutter deck and transmitting power of a power source to the cutter blades. This riding lawn mower is provided with covers 80L and 80R for enclosing a space below the vehicle body across substantially the entire range between the front and rear wheels, and the covers cover a side part of the cutter deck and a side part of the transmission section. The covers are mounted on the vehicle body and have a plurality of small holes 85 for allowing the cutter deck inside the covers to be viewed from the outside across a range facing the side part of the cutter deck.COPYRIGHT: (C)2010,JPO&INPIT【課題】飛散した刈り芝がカッタデッキの上面や伝動部周りに堆積することを抑制し、堆積状況を容易に確認すること。【解決手段】乗用芝刈機10は、左右の前輪12L,12R及び左右の後輪13L,13Rを備えた車体11と、車体の中央下部に昇降可能に設けられ下面が開放されたカッタデッキ20と、カッタデッキの内部に収納されたカッタブレードと、カッタデッキの上面の近傍に設けられ、動力源の動力をカッタブレードに伝達する伝動部50とからなる。乗用芝刈機に、前・後輪間の略全範囲にわたって車体よりも下方の空間を囲うカバー80L,80Rを備えた。カバーでカッタデッキの側部及び伝動部の側部を覆った。カバーは車体に取り付けられ、カッタデッキの側部に臨む範囲にわたって、外方からカバー内のカッタデッキを目視可能な複数の小孔85を有する。【選択図】図2