PROBLEM TO BE SOLVED: To improve workability of removing a transmission shaft in a working machine. A universal joint (29) and an output shaft (28) are provided at a connecting portion to connect the universal joint (29) and the output shaft (28) and allow the universal joint (29) to move away from a connecting portion (58). In addition, a slide connection portion 56 that allows separation of the universal joint 29 and the output shaft 28 is provided. A slide blocking portion 57 is provided which can block and release the movement and separation of the universal joint 29 in the slide connection portion 56. When the slide connecting portion 56 moves the universal joint 29 away from the connecting portion 58, the connection between the transmission shaft 30 and the input shaft 51 at the connecting portion 58 is separated. [Selection diagram] Fig. 4【課題】作業機において、伝動軸の取り外しの作業性を向上させる。【解決手段】自在継手２９と出力軸２８との接続部分に設けられて、自在継手２９と出力軸２８とを接続し、且つ、自在継手２９の接続部５８から離れる側への移動を許容し、且つ、自在継手２９と出力軸２８との分離を許容するスライド接続部５６が設けられる。スライド接続部５６における自在継手２９の移動及び分離を阻止及び阻止解除可能なスライド阻止部５７が設けられる。スライド接続部５６において、自在継手２９の接続部５８から離れる側への移動が行われると、接続部５８における伝動軸３０と入力軸５１との接続が分離される。【選択図】図４
