A first light receiving unit is disposed so as to be separated at a first distance along a contact surface of the living body from a light emitting unit that comes into contact with a living body and radiates light wi th a determined wavelength toward the inside of the living body, presses a first site of the living body at a determined pressure, and receives the light reflected from the living body through the first site. A second light receiving unit is disposed so as to be separated at a second distance along the contact surface of the living body that is longer than the first distance from the light emitting unit that comes into contact with the living body and radiates light with the wavelength toward the inside of the living body, presses a second site that is different from the first site of the living body at a determined pressure, and receives the light reflected from the living body through the second site. A measuring unit measures the pulse wave of the living body based on respective signals that represent light received by the first light receiving unit and light received by the second light receiving unit.
