PROBLEM TO BE SOLVED: To provide a downsized biological sound measurement device that enhances internal pressure of a space housing a sound detector to enable improvement of measurement sensitivity and is capable of keeping a state in which the internal pressure is high for a long period.SOLUTION: A biological sound measurement device 1 comprises: a housing 3 that forms a housing space SP housing a sound detector 8 and has an aperture 3h and a housing cover 4 covering the housing 3. The housing 3 has an external wall surface including: a first wall surface 3a on which the aperture 3h is formed, the first wall surface projecting on the body surface S side most in a contact state a step wall surface 3c positioned at a position closer to the sound detector 8 than the first wall surface 3a a first side wall surface 3b connecting a step between the step wall surface 3c and the first wall surface 3a and a second side wall surface 3d bending with respect to the step wall surface 3c. The housing cover 4 includes: a pressure reception part 4a facing the first wall surface 3a and a first corresponding wall part 4b, second corresponding wall part 4c, and third corresponding wall part 4d that are in close contact with the first side wall surface 3b, step wall surface 3c, and second side wall surface 3d, respectively.SELECTED DRAWING: Figure 2【課題】音検出器を収容する空間の内圧を高めて測定感度を向上することができると共に、内圧の高い状態を長期にわたって維持できる小型の生体音測定装置を提供する。【解決手段】生体音測定装置1は、音検出器8を収容する収容空間SPを形成しかつ開口3hを有するハウジング3と、ハウジング3を覆うハウジングカバー4と、を備える。ハウジング3の外壁面は、開口3hが形成されかつ接触状態で最も体表面S側に突出する第1壁面3aと、第1壁面3aよりも音検出器8寄りに位置する段差壁面3cと、段差壁面3cと第1壁面3aとの段差を繋ぐ第一の側壁面3bと、段差壁面3cに対し屈曲した第二の側壁面3dとを有する。ハウジングカバー4は、第1壁面3aに対面する受圧部4aと、第一の側壁面3b、段差壁面3c、第二の側壁面3dに密着する第一の対応壁部4b、第二の対応壁部4c、第三の対応壁部4dを有する。【選択図】図2