Abstract: A lens unit 1 includes a plurality of lenses aligned in a row along an optical axis L and a lens holder 2. A first lens L1 located the closest to an object-side La includes an object-side lens surface 11, an image-side lens surface 12, and an image-side flange surface 13. A first housing portion 4 accommodating the first lens L1 in the lens holder 2 includes a regulation portion 42 regulating a position of the first lens L1 in the optical axis L direction. The regulation portion 42 includes a lens seating surface 40 in contact with the first lens L1. The image-side flange surface 13 of the first lens L1 includes an outer peripheral region 13A in contact with the lens seating surface 40 of the regulation portion 42 and an inner peripheral region 13B in which a flexible printed circuit board 8 is disposed.

Abstract: A lens unit 1 includes a plurality of lenses aligned in a row along an optical axis L and a lens holder 2. A transparent conductive film 16, which functions as a heater, is disposed on an image-side lens surface 12 of the first lens L1 disposed the closest to an object side La. A flexible printed circuit board 8 that feeds power to the transparent conductive film 16 includes a flat surface portion 81 along an image-side flange surface 13 surrounding an outer peripheral side of the image-side lens surface 12, an extension portion 82 extending to an outer side in a radial direction, and a protruding portion 83 projecting to the outer side in the radial direction from the flat surface portion 81. The protruding portion 83 includes a first electrode 84A and a second electrode 84B electrically connected to the transparent conductive film 16.