A photoplethysmogram signal measurement device for exercise equipment is provided, which includes a photoplethysmogram signal detector for detecting a volumetric variation caused by a blood pressure pulse of a user through a skin surface of a user and then a series of heart rate signals are generated. The photoplethysmogram signal detector includes a carrier, a light emitting device, a light receiving device, a signal digitizer, a processing unit and a detection actuating unit. The detection actuating unit is used to generate an enabling signal to actuate the light receiving device to start receiving a series of photoplethysmogram signals and actuate the processing unit to start receiving a digitized photoplethysmogram signals from the signal digitizer. An optical grating is disposed between the light emitting device and the light receiving device for blocking an outside interference light from interfering the light receiving device.
