The purpose of the present invention is to provide a lens with a lens barrel attached thereto, which is stable and can be airtight. A lens (1) with a lens barrel comprises a cylindrical lens barrel (10) and a lens (20) held by the lens barrel (10) and is characterized by: the lens barrel (10) comprising a lens holding section (12) that comes in contact with the outer peripheral surface (21) of the lens (20); the lens holding section (12) having a first groove section (12a) formed by continuing in a spiral shape, a second groove section (12b) formed by continuing in a spiral shape, and an intermediate area separating the first groove section (12a) and the second groove section (12b); and the intermediate area comprising a protruding section (13) and a third groove section (14).