The traction vessel (20), the supporter who supports above-mentioned engagement section at inside the opening of the human the opening interior arrival vessel which is installed in the upper jaw (10) with the engagement section which is engaged (22,23A, 23B, 24A and 24B) with, by this touching with the face of the above-mentioned human, (21,25,26A and 26B) with, it has, the above-mentioned engagement section hauls the above-mentioned opening interior arrival vessel to the front of the above-mentioned human. Furthermore, the lower part this connection body which this touches with the part where the above-mentioned supporter, the upper this connection body which this touches with the amount among the above-mentioned faces (25) with, is lower side and, than the above-mentioned amount among the above-mentioned faces at the same time the mandible compared to is upper part side (26A and 26B) with, it has.牽引器(20)は、人間の口内にて上顎に装着される口内装着器(10)と係合する係合部(22,23A,23B,24A,24B)と、上記人間の顔面と当接することにより、上記係合部を支持する支持部(21,25,26A,26B)と、を備え、上記係合部が上記口内装着器を上記人間の前方へ牽引する。更に、上記支持部は、上記顔面のうちの額と当接する上部当接体(25)と、上記顔面のうちの、上記額よりも下方側であり且つ下顎よりも上方側である部分と当接する下部当接体(26A,26B)と、を備える。
