A work machine can be connected to a traveling vehicle without tilting the work machine. An extendable top link pivotally supported by the traveling vehicle so as to be vertically swingable, a lower link pivotally supported by the traveling vehicle so as to be vertically swingable, and a first upper connecting portion provided on the work machine. A detachable frame having an engageable second upper connection portion, and a second lower connection portion engageable with the first lower connection portion provided on the work machine； and a top link control mechanism for controlling expansion and contraction of the top link. By pivoting the lower link upward, the second upper connecting portion of the detachably mounted frame in the rearwardly inclined state is engaged with the first upper connecting portion, and the second lower connecting portion is raised by raising the front portion of the work machine. It is possible to bring the first lower connecting portion close to and engage with the portion, and the top link control mechanism can restrict the extension of the top link to hold the detachable frame in the backwardly inclined state, and Work by lower swinging the lower link from the state where the front part is raised But to allow the shortening of the top link until the work attitude. [Selection diagram] Fig. 1【課題】作業機を傾けなくても走行車両に作業機を連結できるようにする。【解決手段】走行車両に上下揺動可能に枢支される伸縮自在なトップリンクと、走行車両に上下揺動可能に枢支されるロアリンクと、作業機に設けた第１上連結部に係合可能な第２上連結部と、作業機に設けた第１下連結部に係合可能な第２下連結部とを有する脱着フレームと、トップリンクの伸縮を制御するトップリンク制御機構とを備え、ロアリンクを上方揺動させることにより、後傾状態の脱着フレームの第２上連結部を第１上連結部に係合させる共に作業機の前部を上昇させることで第２下連結部に第１下連結部を近接させて係合させることが可能であり、トップリンク制御機構は、トップリンクの伸長を規制して脱着フレームを後傾状態に保持可能であり、且つ作業機の前部を上昇させた状態からロアリンクを下方揺動させて作業機が作業姿勢になるまでトップリンクの短縮を許容する。【選択図】図１
