PROBLEM TO BE SOLVED: To provide a clippings collecting-discharging device saving labor in an operation for discharging collected clippings.SOLUTION: The clipping collecting-discharging device 30 includes: a bucket 85 on a lawn mowing unit 2, divided into a body part 86 including a clippings flow inlet 31 and a movable part 87 rotatably connected to an upper end of the body part 86, and operated between a closed position where the body part 86 and the movable part 87 abut against each other and an open position where the movable part 87 is rotated upward and separated from the body part 86; a discharge plate 92 in the bucket 85, positioned near the inlet 31 in a lying posture when the bucket is closed; and a discharge mechanism 91 where the discharge plate 92 stands up toward an opening 96, between the body part 86 and the movable part 87 while interlocking with the operation of the bucket 85, which position is changed to the open position from the closed position.【課題】収集した刈かすの排出作業を省力化できる刈かすの収集排出装置を提供する。【解決手段】刈かすの収集排出装置30は、芝刈りユニット2に取り付けられ、刈かすが流入する流入口31を持つ本体部86と本体部86の上端部に回転可能な状態で連結された可動部87とに分割され、本体部86と可動部87とが突合わされた閉位置と可動部87が上向きに回転して本体部86から離れた開位置との間で動作可能なバケット85と、バケット85の内部に設けられ、閉位置の際に流入口31の近くで横になった姿勢で位置する排出プレート92を有し、排出プレート92が閉位置から開位置へ変化するバケット85の動作に連動して本体部87と可動部87との間の開口96に向かって立ち上がるように排出プレート92を動作させる排出機構91とを備える。【選択図】図19