| 摘要 |
PROBLEM TO BE SOLVED: To provide a mask of which the usability is favorable. SOLUTION: This mask 1 has an upper section a, a lower section b, and a connecting section C. In this case, the lower section b has approximately the same shape as the upper section a. The connecting section C is connected to the lower edge section a2 of the upper section a and the upper edge section b1 of the lower section b. Then, the upper section a is confronted with the lower section b. Also, a folded back section CO is provided on the connecting section C. In the folded back section CO, the lower edge section a2 of the upper section a and the upper edge section b1 of the lower section b are bent so that the connecting section C may not protrude to the outside from the lower edge section a2 of the upper section a and the upper edge section b1 of the lower section b. At the same time, the folded back section CO is folded back at a location which is located on the insides of the lower edge section a2 of the upper section a and the upper edge section b1 of the lower section b. The upper edge section a1 of the upper section a and the lower edge section b2 of the lower section b, also, the lower edge section a2 of the upper section a and the upper edge section b1 of the lower section b are not bonded to each other. Then, the left edge section a3 of the upper section a and the left edge section b3 of the lower section b, also, the right edge section a4 of the upper section a and the right edge section b4 of the lower section b are bonded to each other. |
