Patent ID: 8587883

Claim:
A lens tube comprising: a compound image pickup lens having a plurality of lenses; and a cylindrical lens barrel retaining the compound image pickup lens within an inner wall thereof, wherein the lens barrel has a lens supporting portion formed at one end thereof for totally or partially supporting a peripheral edge at one side surface of the compound image pickup lens in a direction of optical axis, and a lens holding portion formed at the other end thereof confronting totally or partially a peripheral edge at the other side surface of the compound image pickup lens, a rear lens located nearest to an image-forming plane in the compound image pickup lens has a barrel insert portion around a peripheral edge, which is inserted in the lens holding portion with a margin of fitting allowance for clearance fit against an inner peripheral surface at an end of the lens holding portion, and an out-of-barrel lens portion in continuity to the barrel insert portion, of an outer diameter larger than an inner diameter of the lens holding portion, and having a confronting surface at a position spaced from an end surface of the lens holding portion, and at least the end surface of the lens holding portion and the confronting surface of the out-of-barrel lens portion are fixed with an adhesive material through a spaced portion.