A pulse wave sensor includes: a white LED emitting white light to a human body； a G sensor converting, into a first electrical signal, green light included in light emitted from the white LED and reflected within the human body； an R sensor converting, into a second electrical signal, red light included in the light emitted from the white LED and reflected within the human body； and an arithmetic control unit configured to generate a signal showing a heart rate based on a level difference between the first electrical signal and the second electrical signal. Therefore, a distance between the G sensor and the R sensor does not have to be increased, so that an apparatus can be reduced in size.
