A humanoid robot capable of identifying an individual in a natural way is described. This humanoid robot shakes a hand of a person to acquire biological information of the person and identify the individual person. Particularly, a near infrared light emitting device and a near infrared sensor are installed in a hand of the humanoid robot to irradiate a hand of a human being with near infrared light emitted from the near infrared light emitting device and detect a vein pattern by the near infrared sensor. The individual person can be identified by recording and collating this vein pattern.