A camera unit 100 is provided and includes an imaging device for receiving light of an optical image incident from a lens unit; a support board for supporting the imaging device; and a holder having an attachment part to which the support board is attached. The attachment position of the support board in the optical axis direction to the holder is determined by means of an irregularity part formed on the attachment part of the holder or the support board so that the light reception surface of the imaging device matches the image formation position of the optical image.