PROBLEM TO BE SOLVED: To achieve an auxiliary function for detecting the position of a measurement object of ultrasonic measurement at a lower cost.SOLUTION: An ultrasonic probe 50 having an ultrasonic element part 53 for ultrasonic measurement, includes: a first light emission part 54 for emitting red light so as to overlap with an ultrasonic measurement range a second light emission part 56 for emitting near infrared light and a light reception part 57 which receives reflection light of the red light and near infrared light from the back side of a skin of an organism 4, detects a tissue to be the measurement object in the ultrasonic measurement range from the intensity of the received reflection light, and notifies of information that the tissue has been detected with a notification part 58.【課題】超音波計測の計測対象の位置を検出する補助機能を、より安価に実現する。【解決手段】超音波計測用の超音波素子部53を有する超音波プローブ50は、超音波計測範囲に重なるようにして赤色光を照射する第1発光部54および近赤外光を照射する第2発光部56と、生体4の皮下からの当該赤色光および近赤外光の反射光を受光する受光部57とを備える。受光した反射光の強度から超音波計測範囲に計測対象とする組織を検出し、検出されたことを報知部58で報知する。【選択図】図2
