The present invention provides an ultrasonic sensor. The ultrasonic sensor includes a protective layer, a signal receiving layer, a substrate, a signal sending layer and a soft layer stack in that order. The signal receiving layer receives ultrasonic signals from the signal sending layer. The soft layer will be tightly attach to the user’s skin.一種超聲波感測器,用於診斷使用者的健康狀況,包括層疊設置的保護層、信號接收層、基板、信號發送層及柔軟層,該信號接收層用於接收自該信號發送層發送的超聲波信號,該柔軟層用於在使用時與使用者的皮膚貼合。20‧‧‧超聲波感測器21‧‧‧基板210‧‧‧薄膜電晶體22‧‧‧信號接收層221‧‧‧第一電極層222‧‧‧第一壓電層23‧‧‧信號發送層233‧‧‧第二電極層230‧‧‧壓電單元24‧‧‧柔軟層241‧‧‧接觸表面25‧‧‧保護層26,27‧‧‧粘膠層
