To provide a force sensor which is resistant to electromagnetic noise and can easily measure a force applied to a surgical instrument, and the surgical instrument equipped with the force sensor.SOLUTION: The force sensor comprises: an optical fiber pressure sensor consisting of a pressure receiving part and an optical fiber part; a transmission member which is brought into contact with the pressure receiving part by applying a preliminary compression force; and a holding part which holds the optical fiber pressure sensor and the transmission member.SELECTED DRAWING: Figure 2【課題】電磁ノイズに強く、簡便に手術器具に加えられる力を測定することができる力センサおよび力センサを備える手術器具を提供すること。【解決手段】力センサにおいて、受圧部および光ファイバ部からなる光ファイバ圧力センサと、受圧部に予備圧縮力を加えて接触する伝達部材と、光ファイバ圧力センサと伝達部材とを保持する保持部と、からなる構成とした。【選択図】図2