An illumination apparatus is applied for providing illumination to a photographic device having a photographic field-of-view. The illumination apparatus includes an illumination device and a calibration photographic device. The illumination device is pivoted to a side of the photographic device and has an illumination field-of-view. The calibration photographic device has a calibration photographic field-of-view and is connected to the illumination device to make the calibration photographic field-of-view substantially overlap with the illumination field-of-view and make the calibration photographic device move together with the illumination device. The calibration photographic field-of-view at least partially overlaps with the photographic field-of-view. Accordingly, the present invention could improve convenience of the photographic device in mounting the illumination device.