PROBLEM TO BE SOLVED: To provide a portable working machine in which a rotary member is prevented from being assembled in an inappropriate state and the assembling work of the rotary member is facilitated.SOLUTION: In this configuration, cutting blades 11 are mounted so that a boss 162 fits in a cutting blade opening part 111 with respect to a blade support bracket 16. If a blade holding bracket 17 is mounted to the blade support bracket 16 so that three pins 173 are inserted into three pin insertion holes 164, a positional relationship between the blade holding bracket 17 and the blade support bracket 16 becomes adequate. In this case, three pins 173 also pass the inside of the cutting blade opening part 111 like the boss 162, so that the positional relationship between the blade holding bracket 17 and the cutting blade 11 can be kept adequately. Accordingly, the blade holding bracket 17 and the cutting blade 11 can be mounted in an adequate positional relationship with respect to the blade support bracket 16.COPYRIGHT: (C)2015,JPO&INPIT【課題】適正でない状態で回転部材が組み付けられることが抑制され、かつ回転部材の組み付け作業を容易に行うことができる。【解決手段】この構成においては、刃受け金具16に対して、ボス162が刈刃開口部111に嵌合するように刈刃11が装着される。3本のピン173が3つのピン挿入孔164に挿入されるように刃押さえ金具17を刃受け金具16に装着すれば、刃押さえ金具17と刃受け金具16の位置関係も適正となる。この際、3本のピン173もボス162と同様に刈刃開口部111内を通過するために、刃押さえ金具17と刈刃11との間の位置関係も適正に保たれる。このため、刃押さえ金具17、刈刃11を刃受け金具16に対して適正な位置関係で装着することができる。【選択図】図1
