Earphone case and case structure thereof

A box structure, including:

• a body, including an upper inner wall, a lower inner wall, and two side inner walls connecting the upper inner wall and the lower inner wall, wherein the upper inner wall, the lower inner wall, and the two side inner walls form a concave;
• a case cover, including a cover body and a pivot portion connecting the cover body, wherein the pivot portion includes an extension block, and the case cover is pivoted to the body through the pivot portion, wherein the case cover relative to the body has a closed position and an open position;
• a first limiting member, set on the lower inner wall, used to limit the extension block;
• and
• a second limiting member, set on the upper inner wall, used to limit the extension block;
• wherein, when the first limiting member limits the extension block, the case cover is located at the closed position;
• wherein, when the second limiting member limits the extension block, the case cover is located at the open position.