A retractor includes a central fixed portion, an extended arm portion extending on both sides of the central fixed portion, and a hook support section which is attached to the extended arm portion so as to be slidable in a longitudinal direction and supports a retractor hook is formed of a plastically deformable composite member for, when receiving a deformation load of causing a bending deformation, permitting the extended arm portion to be plastically deformed in an in-plane direction Fh in a virtual plane F, which is formed of the central fixed portion and the extended arm portion, while restricting the extended arm portion regarding the deformation in an out-of-plane direction Fv.
