The present invention, which provides a kind of Tong Guo Brazing weldering, can stablize the medical cutting instrument for playing high bond strength. Cutting instrument (A) is constituted by and homework department (2) that the setting of the front end of the shank (1) formed by the stainless steel of pole shape or tool steel is formed by superhard alloy or ceramics. Shank (1) and homework department (the 2 You Brazing welderings portions Jing) (3) connect Brazing welderings portion (3) Tong Guo Jiang the Brazing faces of weld be equipped with either in shank (1) or homework department (2) with the state Jin Hang Brazing welderings that contact with each other into the , Brazing faces of weld or two it is rectangular at protruding portion. The protruding portion being arranged on the Brazing faces of weld is formed to have the inclined surface (5b) of vertex (5a), and the height of inclined surface (5b) is set in shank (the 0. of the diameter of the 1) Brazing faces of weldIn 5% or more and 8% or less range.本發明提供一種通過釺焊能夠穩定發揮高的接合強度的醫療用切削器具。切削器具(A)通過在由圓棒狀的不銹鋼或工具鋼形成的柄部(1)的前端設置由超硬合金或陶瓷形成的作業部(2)而構成。柄部(1)和作業部(2)經由釺焊部(3)連接，釺焊部(3)通過將釺焊面以相互接觸的狀態進行釺焊而成，該釺焊面上設有在柄部(1)或作業部(2)中的任一方或兩方形成的突出部。在釺焊面上設置的突出部形成爲具有頂點(5a)的傾斜面(5b)，傾斜面(5b)的高度設定在柄部(1)釺焊面的直徑的0.5％以上且8％以下的範圍內。
