A biological sensor module includes a light emitter that emits irradiation light with which a living body is irradiated, a light receiver that receives reflected light that is the irradiation light reflected off the living body, and a passage section through which the irradiation light and the reflected light pass. The passage section includes an outer surface section that comes into contact with the living body and an inner surface section that is opposite the outer surface section. The outer surface section has a first convex curved surface that presses the living body, and the inner surface section has a second convex curved surface that collects the reflected light incident on the passage section into a spot on the light receiver.
