Storage box and sheet

A sheet configured to form a storage box by being assembled, wherein

• the storage box includes
• a box main body including a first wall and a second wall extending to intersect a first direction and disposed alongside each other in the first direction, and a peripheral wall extending from a peripheral edge of the first wall to a peripheral edge of the second wall, a tape cassette used in printing being disposed inside a space enclosed by the first wall, the second wall, and the peripheral wall,
• the peripheral wall includes
• a third wall and a fourth wall extending to intersect a second direction orthogonal to the first direction and disposed alongside each other in the second direction, and
• a fifth wall and a sixth wall extending to intersect a third direction orthogonal to the first direction and the second direction and disposed alongside each other in the third direction,
• the first wall includes
• a female flap layer configured by a female flap connected to an end of the third wall in a first specific direction, the first specific direction being a direction, of the first direction, from the second wall toward the first wall,
• a male flap layer configured by a male flap connected to an end of the fourth wall in the first specific direction, and
• an intermediate flap layer configured by a first flap connected to an end of the fifth wall in the first specific direction and by a second flap connected to an end of the sixth wall in the first specific direction,
• the female flap layer, the intermediate flap layer, and the male flap layer are configured to be layered in an order of the female flap layer, the intermediate flap layer and the male flap layer in the first specific direction,
• the female flap includes
• a female main body portion extending, from the end of the third wall in the first specific direction, in a second specific direction, the second specific direction being a direction, of the second direction, from the third wall toward the fourth wall, and
• an insertion slot formed in the female main body portion, and
• the male flap includes
• a male main body portion extending, from the end of the fourth wall in the first specific direction, in a second opposite direction opposite to the second specific direction, and
• a first insertion portion to be inserted into the insertion slot, the first insertion portion extending in the second opposite direction from an end of the male main body portion in the second opposite direction.