Patent ID: 7230777

Claim:
A lens unit, comprising: a an imaging lens including plural lenses and a ring-shaped lens holding member that is provided at at least one place between said plural lenses and holds at least one of said plural lenses; and a cylindrical-shaped lens-barrel including a lens holding portion that holds said imaging lens, wherein each of said plural lenses includes a lens portion having an optical function and a flange portion on a periphery of said lens portion, said flange portion of each of said plural lenses being fittable to said flange portion of at least one of the other lenses of said plural lenses, or said lens holding portion or an inner surface of said lens-barrel, and lenses which are combined with each other through fitting of said flange portions of said lenses have respective shapes in which optical axes of said lenses coincide with each other under a fitting state of said flange portions of said lenses, and wherein said flange portion of one lens of said plural lenses is fitted to said lens holding portion of said lens-barrel and held by said lens holding member in said lens-barrel, and at least two lenses of said plural lenses are positioned by abutting said flange portion of one of said at least two lenses against said lens holding member and an inner surface of said lens-barrel and by fitting said flange portion of another one of said at least two lenses to said flange portion of said one of said at least two lenses, and are arranged in said lens-barrel so that said optical axes of said at least two lenses coincide with said optical axis of said one lens held by said lens holding portion of said lens-barrel.