Patent ID: 8676278

Claim:
A mobile terminal device comprising: a first housing provided with a displaying unit; a second housing on which the first housing is laid; a hinge portion pivotably connecting respective one end portions of the first and second housings with each other such that the first housing moves toward/away from the second housing; and a self-stand maintaining unit for maintaining a self-standing state where the displaying unit is inclined by pivoting the first housing relative to the second housing with the hinge as a pivoting center, as well as moving the first housing and the displaying unit along an axial direction of the hinge portion to bring a side intersecting the one end portion connected to the hinge portion of the first housing into contact with a placement surface, a contact portion on one end of a side surface intersecting the one end portion connected to the hinge portion of the second housing into contact with the placement surface, and the other end at the hinge portion side of the side surface of the second housing not into contact with the placement surface, wherein the hinge portion comprises a first-housing-side receiving portion formed on the first housing, a second-housing-side receiving portion formed on the second housing, and a rotary shaft portion to be attached to the first-housing-side receiving portion and the second-housing-side receiving portion, and the device further comprises a key groove formed on the first-housing-side receiving portion and the second-housing-side receiving portion, which the key groove guides the hinge portion in the axial direction, and a protrusion to be slidably attached to the key groove.