PROBLEM TO BE SOLVED: To increase the lawn capacity of a collector for a lawn mower.SOLUTION: A lawn mower comprises: a mower 1 a collector turning fulcrum shaft 24 disposed at a rear portion of a vehicle body 2 a collector 9 disposed turnably around the collector turning fulcrum shaft 24 and collector turning means 26 for turning the collector 9 around the collector turning fulcrum shaft 24. The lawn grass mowed by the mower 1 is collected, through a guide passage of a shooter 7, into the collector 9, and the collected lawn grass is discharged by the rotation of the collector 9 from the open portion G in a front face to the outside of the lawn mower. The lawn mower is equipped with a movable bottom plate 32 in the bottom portion of the collector 9 to freely increase or decrease the capacity in the collector 9. The movable bottom plate 32 is equipped with side plate portions 32s and 32s and a rear plate portion 32r with suitable heights, and can turn vertically on the rear side around a turning fulcrum shaft 31 on the front side.COPYRIGHT: (C)2014,JPO&INPIT【課題】 芝刈機用コレクタの芝草収容量の拡大を図る。【解決手段】 モーア1と、車体2の後部に設けるコレクタ回動支点軸24と、該コレクタ回動支点軸24回りに回動可能に設けられたコレクタ9と、該コレクタ9を前記コレクタ回動支点軸24回りに回動するコレクタ回動手段26とを備え、モーア1で刈り取られた芝草をシュータ7による案内通路を経てコレクタ9に集草し、この集草した芝草をコレクタ9の回動によって前面の開放部Gから機外に排出する芝刈機において、コレクタ9の底部に可動底板32を備えコレクタ9内の容量を拡縮自在に設ける。可動底板32は、適宜高さの側板部32s,32s及び後板部32rを備え、前側の回動支軸31回りに後側が上下回動できる構成とする。【選択図】 図4