Disclosed is a pulsation detection system for obtaining the accurate pulsation information by removing a noise of a body motion. The system includes a beat detector obtaining a pulse wave information containing a body movement noise and a body motion information, and a pulsation detector outputting a pulsation information after the noise of the body motion is removed from the pulse wave information. The beat detector includes a pulse wave measuring device, and a body motion measuring device having a light source for irradiating light to a skin and a photodetector for detecting a reflected light from the skin, arranged at a position away from the skin. The pulsation detector includes a receiver for receiving the pulse wave information and the body motion information, and a body motion remover for removing the noise so as to output an accurate pulsation information to the output part.