Provided is an oxygen saturation measurement sensor capable of improving the reliability of information of portions having different depths. What is claimed is: 1. A touch panel comprising: a pad that can be attached to a human body a plurality of light sources that are disposed adjacent to each other in a separated state on the pad in a separated state and that irradiate near infrared rays A plurality of light receiving elements arranged so as to correspond to the plurality of light sources on a one-to-one basis and receiving the transmitted light from the corresponding plurality of light sources, and measures transmitted light by the phantom in advance and stores them as reference values And a ROM section for storing the amount of received light of the transmitted light received by the plurality of light receiving elements.深さの異なる部位の情報の信頼性を向上することができる酸素飽和度測定センサを提供すること。 人体に貼り付け可能なパッドと、パッドに離間状態で隣接して配置するとともに近赤外線を照射する複数の光源と、パッドに離間状態で隣接しかつ複数の光源のうち最内側とで共通の中心を基準に複数の光源と1対1で対応するように配置し、対応する複数の光源からの透過光を受光する複数の受光素子と、予めファントムによる透過光を測定して基準値として記憶するとともに複数の受光素子で受光した透過光の受光量を記憶するROM部と、を備える。
