Problem to be solved: to improve the productivity of the interval transmission in a working machine provided with a spacing transmission for changing the supply interval of the agricultural materials by shifting the power transmitted to the working device.The first transmission shaft 61, the second transmission shaft 62 to which the power of the first transmission shaft 61 is transmitted, and the third transmission shaft 63 supported in the same core as the first transmission shaft 61 in contact with the end portion 61A of the first transmission shaft 61 are provided.There are provided shift gears 67, 68 for selecting one pair of the pair of side gears 81, 72 and 73 supported on the second transmission shaft 62 and the lower side gears 81, 82 and 83 supported by the third transmission shaft 63.A stopper portion 74 for stopping movement of the lower side gears 81, 82 and 83 to the first transmission shaft side 61 is formed separately from the third transmission shaft 63, and is attached to the end portion 63A on the side of the first transmission shaft 61 of the third transmission shaft 63.Diagram【課題】作業装置に伝達される動力を変速して農用資材の供給間隔を変更する間隔変速装置が設けられた作業機において、間隔変速装置の生産性を向上させる。【解決手段】第１伝動軸６１、第１伝動軸６１の動力が伝達される第２伝動軸６２、第１伝動軸６１の端部６１ａと接した状態で第１伝動軸６１と同芯状に支持された第３伝動軸６３とが設けられる。第２伝動軸６２に支持された上手側ギヤ７１，７２，７３と、第３伝動軸６３に支持された下手側ギヤ８１，８２，８３との組のうちの一つの組を選択する変速操作部６７，６８が設けられる。下手側ギヤ８１，８２，８３の第１伝動軸側６１への移動を止めるストッパー部７４が、第３伝動軸６３とは別体で構成されて、第３伝動軸６３における第１伝動軸６１側の端部６３ａに取り付けられている。【選択図】図３
