Provided is a technology for supporting a wiring member with a rod-like member including a plurality of rod-like portions connected in the radial direction. A support member configured to be attached to a rod-like member including a plurality of rod-like portions connected in a radial direction includes an engagement portion configured to fit over the plurality of rod-like portions and engage with an outer circumferential portion of the rod-like member, wherein a wiring member is provided in an attachable manner on an outer side of the engagement portion.