A biological information measuring device capable of improving portability is provided. A living body information detecting sensor for detecting living body information of a living body and a housing for housing the living body information detecting sensor, the living body information detecting sensor including a light emitting unit for irradiating light to the living body, and reflection from the living body. A light receiving portion that receives light； a light-transmitting member that transmits reflected light； a sealing portion that seals the light emitting portion and the light receiving portion； a support substrate that supports the light emitting portion, the light receiving portion, and the sealing portion； The housing includes a contact surface that contacts the living body, an inner surface that contacts the support substrate, and an opening that penetrates from the contact surface to the inner surface and that contacts the sealing portion and the inner side surface. The size of the opening is smaller than the size of the opening on the inner surface. [Selection] Figure 9【課題】携帯性を向上させることができる生体情報測定装置を提供する。【解決手段】生体の生体情報を検出する生体情報検出センサーと、生体情報検出センサーを収容するハウジングと、を備え、生体情報検出センサーは、生体に光を照射する発光部と、生体からの反射光を受光する受光部と、反射光を透過する透光性部材からなり、発光部及び受光部を封止する封止部と、発光部、受光部及び封止部を支持する支持基板と、を備え、ハウジングは、生体と接触する接触面と、支持基板と接触する内面と、接触面から内面まで貫通し、封止部と内側側面が接触する開口部と、を有し、接触面における開口部の大きさは、内面における開口部の大きさよりも小さい。【選択図】図９
