A bending structure includes a bending part that is elastically bendable with respect to the axial direction, a movable part serving as an end member that is attached to an end of the bending part in the axial direction, a thin part that is formed at the movable part and is thinner than the movable part in the axial direction, a notch that is provided at the movable part and exposes the thin part in the axial direction in a manner capable of being irradiated with a laser light of laser welding, and a welding part that is formed at the thin part by laser welding and joins the thin part to the bending part.