surgical instrument (1) of the present invention, a treatment to the treatment target site A to perform surgical instrument (1), a cylindrical elongated member having a longitudinal axis (2), the treatment portion connected to the elongated member (2) and (6), and the elongated member (2) Treatment Part (6) and a connecting part for detachably connecting (10) includes a connecting portion (10), the first time connectable to and the treatment portion is fixed to the elongated member (2) (6) It has shaft portion (13), engaging portion first rotating shaft (13) and the treatment portion and (6) the locking state (16) and,本発明の術具(1)は、処置対象部位に対して処置を行う術具(1)であって、長手軸を有する筒状の長尺部材(2)と、長尺部材(2)に連結された処置部(6)と、長尺部材(2)と処置部(6)とを着脱可能に連結する連結部(10)と、を備え、連結部(10)は、長尺部材(2)に固定され且つ処置部(6)に連結可能な第一回動軸部(13)と、第一回動軸部(13)と処置部(6)とを係止状態とする係止部(16)と、を有する。
