To implement the alignment of lenses with a simple configuration or by a simple method. A lens unit includes a plurality of lenses each including a lens portion and a flange portion surrounding the lens portion, and a tube portion that holds the plurality of lenses successively arranged along an optical axis. The holder body includes first and second receive portions successively formed along the optical axis. The first receive portion holds the lenses by pressing the side of the flange portion that extends along the optical axis. The second receive portion receives the lens such that the lens can be moved in a direction crossing the optical axis.