Mobile terminal device

A mobile terminal device comprising:

• at least one hinge part;
• and
• a first enclosure and a second enclosure that are openably and closably connected by way of said hinge part;
• wherein:
• where, in said first enclosure and said second enclosure, surfaces that face the other enclosure in the closed state are opposing surfaces and surfaces that are on the reverse sides of said opposing surfaces are non-opposing surfaces:
• distances between the center of said hinge part and said non-opposing surfaces of each of said first enclosure and said second enclosure are equal;
• when said first enclosure and said second enclosure that are in the closed state are rotated by the angle formed by two normal lines drawn from the center of said hinge part to said non-opposing surface of each of said first enclosure and said second enclosure, the portion at which said non-opposing surface of said first enclosure intersects with said hinge-side side surface matches the portion at which said non-opposing surface of said second enclosure intersects said hinge-side side surface;
• and
• the diameter of said hinge part is no greater than the total length of the distances between the center of said hinge part and said non-opposing surface of each of said first enclosure and said second enclosure.