A body part (2) has an upper surface formed into a convex curve shape, and a cushion member (3) is overlaid on the upper surface of the body part (2). The body part (2) is vertically divided to include an upper section (2a) and a lower section (2b). The cushion member (3) includes an upper cushion member (3A) and a lower cushion member (3B). The upper cushion member (3A) and the lower cushion member (3B) are covered with a cushioning sheet member (4). The sheet member (4) includes attachment means (5) for attachment to the body part (2). An attachment site (6) for the attachment means (5) is provided at the body part (2). The sheet member (4) has a back side where the upper cushion member (3A) is provided. The body part (2) is covered with a cover (11) through the sheet member (4).

A body part (2) has an upper surface formed into a convex curve shape, and a cushion member (3) is overlaid on the upper surface of the body part (2). The body part (2) is vertically divided to include an upper section (2a) and a lower section (2b). The cushion member (3) includes an upper cushion member (3A) and a lower cushion member (3B). The upper cushion member (3A) and the lower cushion member (3B) are covered with a cushioning sheet member (4). The sheet member (4) includes attachment means (5) for attachment to the body part (2). An attachment site (6) for the attachment means (5) is provided at the body part (2). The sheet member (4) has a back side where the upper cushion member (3A) is provided. The body part (2) is covered with a cover (11) through the sheet member (4).

A body part (2) has an upper surface formed into a convex curve shape, and a cushion member (3) is overlaid on the upper surface of the body part (2). The body part (2) is vertically divided to include an upper section (2a) and a lower section (2b). The cushion member (3) includes an upper cushion member (3A) and a lower cushion member (3B). The upper cushion member (3A) and the lower cushion member (3B) are covered with a cushioning sheet member (4). The sheet member (4) includes attachment means (5) for attachment to the body part (2). An attachment site (6) for the attachment means (5) is provided at the body part (2). The sheet member (4) has a back side where the upper cushion member (3A) is provided. The body part (2) is covered with a cover (11) through the sheet member (4).

A body part (2) has an upper surface formed into a convex curve shape, and a cushion member (3) is overlaid on the upper surface of the body part (2). The body part (2) is vertically divided to include an upper section (2a) and a lower section (2b). The cushion member (3) includes an upper cushion member (3A) and a lower cushion member (3B). The upper cushion member (3A) and the lower cushion member (3B) are covered with a cushioning sheet member (4). The sheet member (4) includes attachment means (5) for attachment to the body part (2). An attachment site (6) for the attachment means (5) is provided at the body part (2). The sheet member (4) has a back side where the upper cushion member (3A) is provided. The body part (2) is covered with a cover (11) through the sheet member (4).