PROBLEM TO BE SOLVED: To provide an attachment member attached to an eyeball surface in which a space can be easily secured for arranging light emission means or light reception means compared to a configuration with no reflection part.SOLUTION: A contact member 30 with a reflection part which is an example of an attachment member attached to an eyeball surface includes at least one of a reflection part 33 that reflects a light irradiated onto an eyeball 10 so as to cross an anterior chamber 13, and a reflection part 34 that reflects the light that has crossed the anterior chamber 13 toward the outside of the eyeball 10.SELECTED DRAWING: Figure 1【課題】反射部を有さない構成と比較し、光出射手段又は受光手段を配置する空間の確保が容易な眼球面に装着される装着部材を提供する。【解決手段】眼球面に装着される装着部材の一例である反射部付きコンタクト部材３０は、眼球１０に向けて照射された光を前眼房１３を横切るように反射する反射部３３と、前眼房１３を横切った光を眼球１０の外に向けて反射する反射部３４との少なくとも一方を備える。【選択図】図１
