A slide protector slidably engaged with a slide rail together with a slide support has a harness holder holding a wire harness and a hooking section capable of hooking the slide support with the harness holder and the hooking section formed integrally. Though the wire harness causes a resistance force when the slide support slides rearward in the sliding direction and the slide protector is pulled rearward, reliability of the attachment structure of the slide protector to the slide support can be enhanced since the hooking section and the harness holder holding the wire harness are formed integrally.