In the working machine capable of switching between the storage state and the working state, the durability of the connection portion is high, and the rotating operation of the stable extension work portion can be obtained.First working department andA second working part rotatably connected to the first working part andA first protrusion fixed to said first working partA movement regulating groove is provided to regulate the movement of the first protrusion.A connection portion rotatably connected to the second working part andA power unit for rotating the second working part andAndThe start of rotation of the second working part begins to rotateAn equilibrium state in which the first protrusion does not press the inner wall of the movement regulating groove between the rotation start state and the storage stateThe inner wall of the first sliding region betweenFor the first straight line connecting the first protrusion and the first protrusion in the equilibrium state in the rotation starting stateA curved shape is curved from the contact point between the movement regulating groove and the first protrusion in the rotation starting state.Diagram【課題】収納状態と作業状態とを切り替え可能な作業機において、連結部の耐久性が高く、安定した延長作業部の回動動作を得ること。【解決手段】第１作業部と、前記第１作業部に回動可能に接続された第２作業部と、前記第１作業部に固定された第１突出部と、前記第１突出部の移動を規制する移動規制溝が設けられ、前記第２作業部に回動可能に接続された連結部と、前記第２作業部を回動させる動力部と、を有し、前記第２作業部が回動し始める回動開始状態と、前記回動開始状態と前記収納状態との間において前記第１突出部が前記移動規制溝の内壁を押圧しない均衡状態と、の間の第１摺動領域における前記内壁は、前記回動開始状態における前記第１突出部と前記均衡状態における前記第１突出部とを結ぶ第１直線に対して、前記回動開始状態における前記移動規制溝と前記第１突出部との接点から凹形状に湾曲している。【選択図】図９
