PROBLEM TO BE SOLVED: To provide a riding type lawn mower capable of appropriately installing a ROPS on a riding type lawn mower having high dump specifications or low dump specifications and enhancing safety.SOLUTION: A riding type lawn mower includes: a mower 1 between front wheels 32 and rear wheels 23; a collector 5 on a rear side of the mower 1; support frames 7 of the collector 5; a ROPS support frame 54 arranged in an upper part of the collector support frame 7 and having a wider width than that between the right and left of the collector support frame 7; a ROPS frame 52 having a U shape with an opening part downward and having respective lower edges connected to right/left upper parts of the ROPS support frame 54 respectively; an arm 10 projected at a front side upper edge of the collector 5 and connected to a connection frame 50 connecting between the right/left support frames 7 so as to be turned; and a dump cylinder 8 located between the arm 10 and a vehicle body frame 2 and turning a rear part of the collector 5 upward with the connection frame 50 as a fulcrum. A ROPS 9 is formed by utilizing the right/left collector support frames 7, thereby rational arrangement is achieved with simple constitution.SELECTED DRAWING: Figure 1【課題】ハイダンプ仕様やローダンプ仕様の乗用型芝刈り機にロプスを適切に設置でき、安全性を高めた乗用型芝刈り機の提供である。【解決手段】前輪32と後輪23間のモーア1と、モーア1後方のコレクタ5と、コレクタ5の支持フレーム7と、コレクタ支持フレーム7の上部でコレクタ支持フレーム7の左右間より幅広のロプス支持フレーム54と、下方に開口部を有するコの字型で、各下端部がロプス支持フレーム54の左右上部に各々連結するロプスフレーム52と、コレクタ5の前側上端に突設し、左右の支持フレーム7間を連結する連結フレーム50に回動可能に連結するアーム10と、アーム10と車体フレーム2間にあり、連結フレーム50を支点としてコレクタ5後部を上方に回動させるダンプシリンダ8とを設けた乗用型芝刈り機である。左右のコレクタ支持フレーム7を利用してロプス9を形成することで、簡素な構成で合理的な配置となる。【選択図】図1