PROBLEM TO BE SOLVED: To appropriately measure a heartbeat of an animal. A biological information measuring device includes at least one light emitting element that irradiates an object with irradiation light, a plurality of light receiving elements that detect reflected light of the irradiation light reflected by the object, and An acquisition unit that acquires a detection signal from a plurality of light receiving elements, and a calculation unit that synchronizes a plurality of detection signals acquired from a plurality of light receiving elements and adds the plurality of detection signals to calculate biological information. [Selection diagram] Fig. 3【課題】動物の心拍を適切に測定すること。【解決手段】生体情報測定装置は、対象物に対して照射光を照射する少なくとも１つの発光素子と、対象物で反射された照射光の反射光を検知する複数の受光素子と、反射光の検知信号を複数の受光素子から取得する取得部と、複数の受光素子から取得した複数の検知信号を同期させ、かつ複数の検知信号を加算して生体情報を算出する算出部と、を備える。【選択図】図３
