For the purpose of suturing tissues having different thicknesses through use of a single type of staple, the medical stapler (1) pertaining to the present invention is provided with a first gripping member (3) and a second gripping member (4) which are provided so as to be capable of opening and closing with each other and which are capable of gripping a tissue therebetween in a closed state, the first gripping member (3) being provided with a first contact surface (3a) placed in close contact with one side of a tissue in the closed state, and ejection holes (3b) for ejecting staples (7), the ejection holes (3b) being formed in the first contact surface (3a), the second gripping member (4) being provided with a second contact surface (4a) placed in close contact with the other side of the tissue in the closed state, and an anvil part (11) having curved surfaces for bending, in a predetermined direction, needle parts (7b) of the staples (7) ejected from the ejection holes (3b), the anvil part (11) being provided to the second contact surface (4a), and the first gripping member (3) and the second gripping member (4) being provided so that the positions thereof are adjustable relative to each other in a direction tangent to the curved surfaces.Afin de suturer des tissus ayant différentes épaisseurs au moyen dun seul type dagrafe, lagrafeuse médicale (1) selon la présente invention est pourvue dun premier élément de préhension (3) et dun deuxième élément de préhension (4) qui sont disposés de façon à pouvoir souvrir et se fermer lun avec lautre et qui permettent de saisir un tissu entre eux dans un état fermé, le premier élément de préhension (3) étant pourvu dune première surface de contact (3a) placée en contact étroit avec un côté dun tissu dans létat fermé, et des trous déjection (3b) pour éjecter les agrafes (7), les trous déjection (3b) étant formés dans la première surface de contact (3a), le deuxième élément de préhension (4) étant pourvu dune deuxième surface d
