PROBLEM TO BE SOLVED: To provide a turf working machine in which a blade unit can be easily attached to and detached from a main body. SOLUTION: A main body unit 2 having a drive source 251 and outputting rotational power from a drive pulley 2521 connected to the drive source 251 and a driven pulley 424 which is detachable from the main body unit 2 and receives the rotational power. It is located between the blade unit 4 having a blade that moves by receiving the rotational power, the belt 5 spanned between the drive pulley 2521 and the driven pulley 424, and the drive pulley 2521 and the driven pulley 424. A tension adding portion 62 that moves between a first state in which tension is applied to the belt 5 by contacting the belt 5 and a second state in which tension is applied to the belt 5 as compared to the first state. To be equipped. [Selection diagram] Fig. 5【課題】本体に対して刃体ユニットを着脱する作業が容易な芝用作業機を提供する。【解決手段】駆動源２５１を備え、該駆動源２５１に連結する駆動プーリ２５２１から回転動力を出力する本体ユニット２と、本体ユニット２に対して着脱可能で、前記回転動力を受ける従動プーリ４２４、及び、前記回転動力を受けることにより移動する刃を有する刃体ユニット４と、駆動プーリ２５２１と従動プーリ４２４とに掛け渡されたベルト５と、駆動プーリ２５２１と従動プーリ４２４との間に位置し、ベルト５に接触することで該ベルト５に張力を与える第１状態と、ベルト５に対して該第１状態に比べて小さな張力を与える第２状態との間で移動するテンション付加部６２とを備える。【選択図】図５
