[PROBLEMS] For example, an operation part such as holding a suture needle does not have magnetism, does not cause metal allergy, has excellent operability, excellent chemical resistance, corrosion resistance, wear resistance, and metal fatigue resistance. An excellent low-cost surgical instrument is provided. A surgical instrument comprising: a handle portion held by a surgeon's hand; and a distal-side operated portion connected directly or indirectly to the handle portion; Formed of a stainless steel material, and the operated portion is formed of titanium, titanium oxide, or a titanium alloy material, and the titanium material of the holding portion and the stainless steel material of the handle portion are joined together with the titanium material and the stainless steel material. This is performed by melting and joining by Joule heat generated by applying a current of a predetermined value for a predetermined time while maintaining the contact state of the bonding surfaces. [Selection] Figure 1【課題】例えば縫合針を保持する等の被操作部が磁性を帯びず、金属アレルギーを生じさせず、操作性に優れ、耐薬品性、耐腐食性、耐摩耗性に優れ、耐金属疲労性能に優れた低コストの外科手術用器具を提供する。【解決手段】外科施術者の手に握られるハンドル部と、当該ハンドル部に直接的又は間接的に接続された先端側の被操作部と、から構成された外科手術用器具において、前記ハンドル部、ステンレス素材により形成され、前記被操作部は、チタニウム、チタニウム酸化物又はチタニウム合金素材により形成され、前記保持部のチタン素材と前記ハンドル部のステンレス素材の接合は、当該チタン素材と当該ステンレス素材の接合面の接触状態を維持させた状態で、所定値の電流を所定時間通電させることにより生じるジュール熱による溶解接合により行われる。【選択図】図1