The present disclosure provides a stethoscope head assembly. The stethoscope head assembly comprises a diaphragm and a main body. The diaphragm comprises a membrane portion, and a sealing portion extending from a periphery of the membrane portion and comprising a ring-shaped raised platform and a connecting portion extending downwardly from a periphery of the ring-shaped raised platform. The main-body is detachably coupled to the diaphragm and comprises a sound gathering member. The connecting portion and the ring-shaped raised platform of the diaphragm cooperatively form a ring-shaped receiving slot for receiving the sound gathering member of the main body.本發明提供一種用於聽診頭組件的膜片。該聽診頭組件包括一膜片及一主體。該膜片包括一薄膜部和一密封部，該密封部係從該薄膜部的一邊緣延伸且包括一環形凸起平台以及從該環形凸起平台之一邊緣向下延伸的一連接部。一主體可拆卸地連接該膜片，包括一收音構件。其中該膜片的該連接部及該環形凸起平台共同形成一環形容置槽，該環形容置槽用於容納該主體的該收音構件。
