A lens unit includes at least three lenses that are laminated and received in a lens barrel. The lenses include a first lens, a second lens, and a third lens that are laminated from the side of an object in this order. The first lens includes a first contact face that is formed at an outer peripheral portion thereof and comes in contact with the second lens, and a first opposite surface that is formed at an inner peripheral portion of the first contact face, is spaced from the second lens, and faces the second lens. The second lens includes a second contact face that is formed at a position closer to the center of the second lens than the first contact face and comes in contact with the third lens, and a second opposite surface that is formed at an outer peripheral portion of the second contact face, is spaced from the third lens, and faces the third lens.