PROBLEM TO BE SOLVED: To facilitate the assembling of a side clutch to a side clutch shaft, in a transmission device of a working machine such as a combine.SOLUTION: In a slide unit 91 in a pair of side clutches 83, at an external peripheral part of a cylinder shaft 85 which is externally fit of a side clutch shaft 46 so as to be relatively rotatable in a state of being detachable by slide movement, there are arranged: a moving-side rotating body 86 for engagement a compression spring 88 for turn-in energization a stopper 89 which receives the moving-side rotating body 86 at a turn-in position and a spring receiver 90 for the compression spring in such an arrangement that the moving-side rotating body 86 and the compression spring 88 are located between the stopper 89 and the spring receiver 90 so that the moving-side rotating body 86 integrally rotates together with the cylinder shaft 85 in a state that the moving-side rotating body can slide to an axial core direction of the side clutch shaft 46 with respect to the cylinder shaft 85, and the cylinder shaft 85, the moving-side rotating body 86, the compression spring 88, the stopper 89 and the spring receiver 90 are made to integrally slide to the side clutch shaft 46 so as to be detachable in the axial core direction of the side clutch shaft 46.COPYRIGHT: (C)2015,JPO&INPIT【課題】コンバイン等の作業機用の伝動装置において、サイドクラッチ軸に対するサイドクラッチの組み付けを容易にする。【解決手段】一対のサイドクラッチ83において、サイドクラッチ軸46に対して摺動による着脱が可能な状態で相対回転可能に外嵌する筒軸85の外周部に、噛合用の移動側回転体86と、入り付勢用の圧縮バネ88と、移動側回転体86を入り位置にて受け止めるストッパ89と、圧縮バネ用のバネ受け90とを、ストッパ89とバネ受け90との間に移動側回転体86と圧縮バネ88とが位置する配置で、移動側回転体86が筒軸85に対してサイドクラッチ軸46の軸心方向に摺動可能な状態で筒軸85と一体回転するように装備して、筒軸85と移動側回転体86と圧縮バネ88とストッパ89とバネ受け90とを、サイドクラッチ軸46に対してサイドクラッチ軸46の軸心方向に着脱可能に一体摺動する摺動ユニット91に構成した。【選択図】図11