Patent ID: 8471947

Claim:
An image pickup apparatus comprising: an image taking optical system configured to cause light to form an optical image; an optical filter into which the light from the image taking optical system enters; an image pickup element configured to electrically convert the optical image formed by the light that has passed through the optical filter; an image pickup element holding member configured to hold the image pickup element and the optical filter; a lens holding member configured to hold an image surface side lens unit that is disposed closest to the optical filter among lens units included in the image taking optical system; a drive mechanism configured to move at least one holding member of the lens holding member and the image pickup element holding member in the optical axis direction; and a guide member configured to guide the at least one holding member in the optical axis direction, wherein the lens holding member and the image pickup element holding member are moved relatively to each other in an optical axis direction of the image taking optical system, wherein the lens holding member and the image pickup element holding member include dust-proof walls that surround a space between the image surface side lens unit and the optical filter and mutually overlap in all directions orthogonal to the optical axis direction in an entire range where the lens holding member and the image pickup element holding member are moved relatively to each other, and wherein the dust-proof walls are formed further inside in the directions orthogonal to the optical axis direction than the drive mechanism and the guide member.