A biosensor that includes a light transmissive electrocardiographic electrode and a light transmissive insulating film that detect an electrical signal relating to an electrocardiographic signal through capacitive coupling that are disposed above light emitting elements and a light receiving element that detect an optical detection signal relating to a photo-plethysmographic signal. When a user brings a finger into contact with a contact surface of the light transmissive insulating film, the electrical signal relating to the electrocardiographic signal is detected by the light transmissive electrocardiographic electrode. At the same time, reflected light emitted from the light emitting elements after being reflected from the users finger are received by the light receiving element to detect an optical detection signal corresponding to the received reflected lights so that biological information is generated based on both the electrocardiographic signal and a photo-plethysmographic signal.
