Container and structure

A container, comprising:

• a first side wall and a second side wall facing each other;
• a third side wall provided therebetween;
• a first upper wall and a second upper wall;
• and
• a locking member,
• wherein the first side wall and the second side wall face each other,
• the first upper wall and the second upper wall are configured to be rotatable with respect to the first side wall and the second side wall, respectively, and each comprise a convex portion protruding toward the locking member,
• the convex portions are provided with ridges, respectively, at a portion corresponding to a parting line for manufacturing the first upper wall and the second upper wall, wherein the ridges are provided to increase a thickness of the convex portions,
• the locking member comprises a fixed portion and an engagement portion, the fixed portion being fixed to the third side wall, the engagement portion being engaged with at least one of the first upper wall and the second upper wall to prevent the first upper wall and the second upper wall from opening, and
• an inclined portion inclined away from the first upper wall and the second upper wall is provided at an upper end of the engagement portion in an engaged state, when starting from the first upper wall and the second upper wall.