is the cross sectional diagram of a c is a diagram wherein right and left inner surfaces of b are moved closer and fold down wherein 30 is the front side surface of the storage box 31 is a concave shape groove set up in 30 30 u2032 is an inner surface of the storage box and 31 u2032 is a convex shape line placed on the opposite side of 31 the side of the storage box may be formed by just folding down the flat surface once or it may be of the shape mentioned above in the preceding paragraph 0113 furthermore the shape of the storage box may be rectangular parallelepiped cube or curved shape formed by curling up the sides or corners there are various shapes formed by a polyhedron formed of a straight surface or curved surface and there is no limit on the styles fig3 is a diagram illustrating an example of the portion of the sheet removing opening as illustrated in fig2 with some portions changed wherein 32 is the portion with 25 or 25 u2032 illustrated in fig2 changed to a smooth concave shape a is the portion with a space between 17 u2032 and 17 u2033 changed to 32 b is the portion with 25 u2032 changed to 32 and c is the portion with 25 u2032 present between 26 changed to 32 the depression with a shape mentioned in the above 32 is not a desirable shape as the pulling force of the sheet at the time of pulling the sheet out is less fig3 is a diagram illustrating an example wherein 25 is formed by contacting adjacent 17 mentioned in fig1 in.