The purpose of the invention is to allow a work machine (3) to be coupled to a traveling vehicle (2) without inclining the work machine (3). The invention comprises: an expandable top link (6) that is pivotably supported in the traveling vehicle (2) to be able to swing vertically； a lower link (7) that is pivotably supported in the traveling vehicle (2) to be able to swing vertically； a detachable frame (30) that has a second upper coupling unit (33) that can engage with a first upper coupling unit (26) provided on the work machine (3) and a second lower coupling unit (34) that can engage with a first lower coupling unit (27) provided on the work machine (3)； and a top link control mechanism (36) that can control expansion and contraction of the top link (6). By swinging the lower link (7) up, the second upper coupling unit (33) of the detachable frame (30), which has been tilted back, can engage with the first upper coupling unit (26) and the first lower coupling unit (27) can be brought closer to and engage with the second lower coupling unit (34) by the front of the work machine (3) being raised. The top link control mechanism (36) can hold the detachable frame (30) in a tilted back state by restricting the expansion of the top link (6) and allows the top link (6) to contract until the work machine (3) is in a working orientation by swinging the lower link (7) down from a state in which the front of the work machine is raised.Le but de l'invention est de permettre de coupler une machine de travail (3) à un véhicule (2) sans incliner la machine de travail (3). L'invention comprend : une liaison supérieure extensible (6) qui est supportée de manière pivotante par le véhicule (2) pour qu'elle puisse pivoter verticalement ； une liaison inférieure (7) qui est supportée de manière pivotante par le véhicule (2) pour qu'elle puisse pivoter verticalement ； une structure amovible (30) qui a une seconde unité de couplage supérieure (33) qui peut venir en prise avec une prem
