A biological sound measurement apparatus includes a housing that has an opening and defines a housing space in which a sound detector is housed, and a housing cover that covers the housing. An outer wall surface of the housing includes a first wall surface that protrudes farthest toward a body surface in a contact state and includes the opening, a step wall surface that is closer to the sound detector than the first wall surface, a first side wall surface that connects a level difference between the step wall surface and the first wall surface, and a second side wall surface that is bent relative to the step wall surface. The housing cover includes a pressure receiving portion that faces the first wall surface, and a first corresponding wall portion, a second corresponding wall portion, and a third corresponding wall portion that are in close contact with the first side wall surface, the step wall surface, and the second side wall surface.
