| 摘要 |
PROBLEM TO BE SOLVED: To strike a balance between an increase in the tightening force of a lock portion to a lock hole and an improvement in the easiness of installation of an auxiliary plate to a back holder.SOLUTION: A pad cover includes a third lock portion 33 which is inserted into a third lock hole 46 of a back holder 40. A support plate (auxiliary plate) 90 attached to the back holder 40 from the front side includes a third pressing piece 108 pressed against an inner wall surface of the third locking hole 46. The third pressing piece 108 includes a third extension part 109 extending rearward, a third curved part 110 curved so as to inflate rearward, and a third distal end part 111 which is brought into contact with the third lock part 33 and the distal end of which faces forward, and is generally structured in a U- or V-shape extending rearward. The third distal end part 111 of the third pressing piece 108 is brought into contact with the third lock part 33 in or near the third lock hole 46. |
