An image pickup apparatus includes: an objective optical system for focusing a bundle of light rays from an object into an image； an image sensor placed in the vicinity of the image-forming position of the objective optical system； a dividing element placed between the objective optical system and the image sensor and used for dividing a bundle of light rays from the objective optical system into reflected and transmitted bundles of light rays； a first reflection member for reflecting back the bundle of light rays reflected by the dividing element； and a second reflection member for reflecting the bundle of light rays transmitted by the dividing element, wherein the bundle of light rays reflected by the first reflection member via the dividing element is focused to form an image on a first area of the image sensor, and the bundle of light rays reflected by the second reflection member is focused to form an image on a second area of the image sensor, the second area of the image sensor being different from the first area of the image sensor.
