Problem to be solved: to set the connection speed of the PTO clutch easily according to the load on the prime mover.The PTO shaft driving device is a PTO clutch capable of switching between a PTO shaft capable of transmitting power of a propulsion shaft to which a power of a prime mover is transmitted, a connection state for connecting the propulsion shaft to the PTO shaft, and a disconnection state without connecting the propulsion shaft and the PTO shaft, and the connecting speed of the PTO clutch In this connection, there is provided a control device capable of setting a first connection speed at which the load to the prime mover at the time of connection is set to be equal to or lower than a threshold value.Diagram【課題】原動機に対する負荷に応じて簡単にPTOクラッチの接続速度を設定することができるようにする。【解決手段】PTO軸の駆動装置は、原動機の動力が伝達される推進軸の動力を伝達可能なPTO軸と、推進軸とPTO軸とを接続する接続状態と、推進軸とPTO軸とを接続しない切断状態とに切り換え可能なPTOクラッチと、PTOクラッチの接続速度に関し、接続時における原動機に対する負荷が閾値以下となる第1接続速度を設定可能な制御装置と、を備えている。【選択図】図2
