Patent ID: 8750700

Claim:
A focus detection unit comprising: a field lens disposed in an primary image-forming area of an image taking optical system and into which light from the image taking optical system enters; a conductive member electrically connected with a lens holding member, wherein the conductive member is connected with the field lens at a first face side of the field lens, wherein the first face side is an entrance surface for light from the image taking lens; a lens holding member holding the field lens and having a conductive property, wherein the lens holding member is connected with the field lens at a second face side of the field lens; a secondary image-forming lens causing the light from the field lens to form plural optical images; a light-receiving element converting the plural optical images into electric signals; a focus detection part configured to detect a focus state of the image taking optical system by using the electric signals; and a camera chassis having a conductive property, wherein a coating having a light transmissive property and a conductive property is provided on the first face side of the field lens, and wherein the coating is electrically connected with the camera chassis through the conductive member and the lens holding member.