A lens barrel for imaging a subject; and a lens frame which holds the lens. The lens frame includes a body structure opened at a tip and an end; and a lens base which fixes the lens and is adhered to a tip opening of the body; the lens base includes: a tip base including an opening which exposes a tip side lens optical surface and an inner side which supports the lens; and a circle or arc sidewall extending axially from the tip base; the inner surface of the sidewall is formed along an outer circumference surface of the lens; the inner side surface and the outer circumference are adhered to each other; and a portion of the upper surface of the sidewall is provided toward an end side separated from the far end of the lens to be exposed inside the body.