A pulse wave measuring apparatus including a semiconductor substrate (1) having a pressure-sensing device on a main surface and a protection member (12) having an accommodation space accommodating the semiconductor substrate (1) detects a pulse wave of an artery located in a living body by pressing the semiconductor substrate (1) against the living body. A wall surface (20a) of the protection member (12) forming the accommodation space is arranged such that an air chamber (20) is interposed between the wall surface (20a) and an end surface of the semiconductor substrate (1), and the end surface of the semiconductor substrate (1) is exposed to air. The pulse wave measuring apparatus structured in this manner allows accurate and stable measurement of the pulse wave.