<p>An imaging apparatus is composed of a lens tube (3) arranged concentrically with an imaging element (2); a lens barrel (4) which has an imaging lens (5) removably inserted from the leading end section side of the lens tube (3); a cover (6) removably fitted at the leading end section of the lens tube (3); and a cam mechanism section arranged on the lens barrel (4), the lens tube (3) and the cover (6) so that the lens barrel (4) turns around the optical axis to the imaging element (2) and that the lens barrel moves in the optical axis direction by such turning. The cam mechanism section is composed of a first cam surface (10a) formed on the inner circumference surface of the lens tube (3); a cam protruding section (10b) formed on the outer circumference surface of the lens barrel (4); and a second cam surface (10c) formed on the inner surface of the cover (6). The cam mechanism section smoothly turns the lens barrel (4) around the optical axis and moves the lens barrel in the optical axis direction. The cam mechanism section can be easily manufactured at low cost.</p>
