A clip unit includes: a clip body having a pair of arm parts and a fastening ring arranged in the outside of the clip body and configured to maintain the arm parts in the closed state, in which the clip body includes a connection base section connecting the base end side of the pair of arm parts, and a connection tail section provided on the connection base section to extend opposite to the arm parts and connected to the front end of a transmission member, and the connection base section has a flat part perpendicular to the axial direction of the fastening ring, and the arm parts and the connection tail section are connected on a side of the flat part.
