An image pickup apparatus capable of capturing a composite image of a visible-light image and an infrared image of a subject is provided, whereby the configuration is simplified and made more convenient. A visible-light source (20) and an excitation-light source (22) for exciting a phosphorescent substance are provided as a light source (6) for a subject that includes an infrared-fluorescent substance. The light from the subject is passed through an optical filter (10) and directed into a CCD image sensor (12). The optical filter (10) cuts excitation light and transmits fluorescent light. The transmittance of visible light by the optical filter (10) is set lower than the transmittance of fluorescent light so that the weak infrared image from the fluorescent light is clearly displayed over the visible-light image. Since the CCD image sensor (12) is sensitive to infrared light as well as to visible light, an image signal is outputted for the composite image according to the incident light from the optical filter (10).
