Band connecting device and head mounted display including the same

A head mounted display device comprising:

• a main frame including surface formed to face a facial side of a user and an opposite surface on which an external electronic device is mounted;
• a connecting device connected to the main frame;
• and
• a support part connected to the connecting device that fixes the head mounted display device to the facial side of the user,
• wherein the connecting device comprises:
• a first end part connected to the main frame;
• and
• a second end part extended from and inclined to the first end part and connected to the support part,
• wherein a first line extending from an upper end of the first end part to a lower end of the first end part, and
• a second line extending from an upper end of the second end part to a lower end of the second end part form a predetermined incline angle.