A holding section (28) is formed at a leading end of an attaching section (26), said holding section having no double-sided tape (27), i.e., an adhesive material, formed thereon. Consequently, a worker can peel release paper from the double-sided tape (27), while holding the holding section (28). As a result, at the time of peeling the release paper, significant deformation of the attaching section (26) can be suppressed even if stress is applied to the attaching section (26). Consequently, the attaching section (26) can be prevented from being deformed and damaged.