To obtain a more compact lens barrel having three reflecting surfaces, configured so that an optical axis of light reflected by a reflecting member arranged closest to the object side may be parallel to an optical axis of light reflected by a reflecting member arranged closest to the image side, and to obtain an imaging apparatus.

In the lens barrel, the reflecting member disposed closest to the object side is arranged at the inside of the outside surface facing the reflecting surface arranged closest to the image side, of the imaging element.