PROBLEM TO BE SOLVED: To provide a work machine in which movement of a pump drive shaft with the reciprocating swing of a swinging operation part can be surely suppressed.SOLUTION: There is provided a work machine including: a first one-way rotation mechanism 58 which is interposed in a power-transmitting system from a swinging operation part to a pump drive shaft 52 and which transmits a driving force to the pump drive shaft 52 by swinging operation to one direction side, and which is permitted to rotate relatively with respect to the pump drive shaft 52 in the swinging operation to the reverse direction side and a second one-way rotation mechanism 75 configured in such a way that the relative rotation of the pump drive shaft 52 with respect to the housing case is permitted in the swinging operation of the one side of the swinging operation part 57, and the relative rotation to the reverse direction to the rotation direction in one direction side of the pump drive shaft 52 with respect to the housing case 54 is suppressed in the swinging operation to the reverse direction side of the swinging operation part 57.COPYRIGHT: (C)2015,JPO&INPIT【課題】ポンプ駆動軸が揺動作動部の往復揺動に連れて動くことを確実に抑制できるようにする。【解決手段】揺動作動部からポンプ駆動軸52への動力伝達系に、一方向側への揺動操作でポンプ駆動軸52に駆動力を伝え、逆方向側への揺動操作ではポンプ駆動軸52との相対回転が許容される第1一方向回転機構58が介在され、揺動作動部57の一方側の揺動操作では収容ケースに対するポンプ駆動軸52の相対回転が許容され、揺動作動部57の逆方向側への揺動操作では収容ケース54に対するポンプ駆動軸52の一方向側への回転方向とは逆方向への相対回転が抑制されるように構成された第2一方向回転機構75を備えた。【選択図】図19
