Head mounted display device

A head mounted display device, comprising:

• a host, has two connecting bases located on opposite sides of the host;
• two sliding parts, respectively slidably connected to the corresponding connecting base;
• two locking parts, respectively used to lock the corresponding sliding part in a retracted position or a pulled-out position relative to the corresponding connecting base;
• and
• two brackets, respectively pivotally connected to one end of the corresponding sliding part away from the host,
• wherein each of the connecting bases has a hole, each of the locking parts has a first segment and a second segment connected to each other, a rod diameter of the first segment of each of the locking parts is larger than a rod diameter of the second segment, each of the sliding parts has a slot, each of the slots has a connecting section and a first end and a second end located at both ends of the connecting section, a hole diameter of each of the first ends and a hole diameter of each of the second ends are greater than or equal to the rod diameter of each of the first segments, a width of each of the connecting sections is less than the rod diameter of each of the first segments and greater than or equal to the rod diameter of each of the second segments, a hole diameter of each of the holes is smaller than the rod diameter of each of the first segments and greater than or equal to the rod diameter of each of the second segments, each of the second segments passes through the corresponding hole,
• when each of the locking parts locks the corresponding sliding part in the retracted position, the first segment is located at the first end, and
• when each of the locking parts locks the corresponding sliding part in the pulled-out position, the first segment is located at the second end.