PROBLEM TO BE SOLVED: To accurately measure an arterial oxygen saturation by suitably holding an installation portion of the finger or the like without tightening.SOLUTION: A pulse oxymeter probe includes a pair of housings whose tips are connected and separated so as to be openably/closably connected, and an energization member which energizes in a direction of closing the tips of the pair of housings, and inserts a measurement portion of a subject from the tip side into the pair of housings so as to transmits light from a light emission part and make a light receiving part receive light. In the pair of housings, there is provided in the inner surface of at least one housing in the inner surfaces which abut on the measurement portion to be inserted, a projection surface which is arranged at the tip side of the pair of housings than the light emission part and the light receiving part, and is provided projecting to the inner surface side of the other housing, and the projection surface holds the measurement portion together with the other housing.SELECTED DRAWING: Figure 4【課題】指等の装着部位を締め付けることなく好適に保持して、動脈血酸素飽和度を正確に測定すること。【解決手段】先端部同士が接近離反して開閉自在に連結される一対のハウジングと、前記一対のハウジングの前記先端部同士を閉じる方向に付勢する付勢部材と、を有し、被検者の測定部位を先端部側から一対のハウジング間に挿入して発光部からの光を透過して受光部に受光させるパルスオキシメータプローブである。一対のハウジングにおいて、挿入される測定部位に接触するそれぞれの内面のうち少なくとも一方のハウジングの内面には、発光部及び受光部よりも前記一対のハウジングの先端部側に配置され、且つ、他方のハウジングの内面側に突出して設けられる突出面部が設けられ、突出面部は、前記他方のハウジングとともに前記測定部位を挟持する。【選択図】図４
