A pulsation detection system comprising, a beat detector for obtaining (i) a pulse wave information containing a noise generated by a body motion and (ii) a body motion information, from a living body in physical exercise movement, and a pulsation detector for detecting a pulsation information from which is removed the noise of the body motion from the pulse wave information based on the body motion information and then outputting the detected pulsation information to an output part, and wherein the beat detector comprises, (a) a pulse wave measuring device, for detecting the pulse wave information, comprising two light sources (31a, 31b) which irradiate light to a skin of the living body, and a photodetector which receives the diffused light reflected from the skin, (b) a body motion measuring device, for detecting the body motion information, comprising a body motion light source which irradiates a diffused light to the skin, and a body motion photodetector which receives the diffused light reflected from the skin, (c) a transmitter for transmitting the pulse wave information and the body motion information to the pulsation detector, and (d) a mounting tool for mounting the pulse wave measuring device, the body motion measuring device, and the transmitter, to a surface of the living body, characterized in that: the light sources (31a, 31b) and the photodetector of the pulse wave measuring device are positioned at a first distance from the skin, the body motion light source of the body measuring device is positioned at an elevation angle toward the skin, and the body motion light source and the body motion photodetector are positioned at a second distance from the skin, wherein the second distance is bigger than the first distance, the light sources (31a, 31b) and the body motion light source have an identical light color, the pulsation detector comprises, a receiver for receiving the pulse wave information and body motion information which are transmitted by the transmitter, and a body motion remover for removing the noise, which is contained in the received pulse wave information, from the received pulse wave information based on the body motion information, to detect the pulsation information and for outputting the pulsation information to the output part. (a) a pulse wave measuring device, for detecting the pulse wave information, comprising two light sources (31a, 31b) which irradiate light to a skin of the living body, and a photodetector which receives the diffused light reflected from the skin, (b) a body motion measuring device, for detecting the body motion information, comprising a body motion light source which irradiates a diffused light to the skin, and a body motion photodetector which receives the diffused light reflected from the skin, (c) a transmitter for transmitting the pulse wave information and the body motion information to the pulsation detector, and (d) a mounting tool for mounting the pulse wave measuring device, the body motion measuring device, and the transmitter, to a surface of the living body, characterized in that: the light sources (31a, 31b) and the photodetector of the pulse wave measuring device are positioned at a first distance from the skin, the body motion light source of the body measuring device is positioned at an elevation angle toward the skin, and the body motion light source and the body motion photodetector are positioned at a second distance from the skin, wherein the second distance is bigger than the first distance, the light sources (31a, 31b) and the body motion light source have an identical light color, the pulsation detector comprises, a receiver for receiving the pulse wave information and body motion information which are transmitted by the transmitter, and a body motion remover for removing the noise, which is contained in the received pulse wave information, from the received pulse wave information based on the body motion information, to detect the pulsation information and for outputting the pulsation information to the output part. the light sources (31a, 31b) and the photodetector of the pulse wave measuring device are positioned at a first distance from the skin, the body motion light source of the body measuring device is positioned at an elevation angle toward the skin, and the body motion light source and the body motion photodetector are positioned at a second distance from the skin, wherein the second distance is bigger than the first distance, the light sources (31a, 31b) and the body motion light source have an identical light color, the pulsation detector comprises, a receiver for receiving the pulse wave information and body motion information which are transmitted by the transmitter, and a body motion remover for removing the noise, which is contained in the received pulse wave information, from the received pulse wave information based on the body motion information, to detect the pulsation information and for outputting the pulsation information to the output part.