A mobile terminal device comprising: a first housing that comprises a first frame; a second housing that comprises a second frame; and hinges (51, 52) that couple the first frame and the second frame around a pivotal axis, wherein: the first frame comprises first supporting members (32, 33) each of which are provided on each end of the first frame in a direction of the pivotal axis and the first supporting members (32, 33) extend in a direction away from the pivotal axis, the second frame comprises a second supporting members (42, 43) each of which are provided on each end of the second frame in the direction of the pivotal axis and the second supporting members (42, 43) extend in a direction away from the pivotal axis, and the hinges (51, 52) are provided on each end of the first and second frames (30, 40) in the direction of the pivotal axis, each of the hinges (51, 52) provided on the outside of the first and second supporting members (32, 33, 42, 43) in the direction of the pivotal axis, the first housing comprises a first touch panel provided on a principal surface of the first housing, the second housing comprises a second touch panel provided on a principal surface of the second housing, the hinges (51, 52) couple the first and second housings (10, 20) in such a way as to allow the first and second housings (10, 20) to be in an opened state in which the principal surface of the first housing and the principal surface of the second housing are substantially on the same plane and in a closed state in which the principal surface of the first housing and the principal surface of the second housing face outwardly, and when the first and second housings (10, 20) are in the opened state, the hinges (51, 52) generate a torque being a sum of a first torque to counteract weights of the first and second housings (10, 20) and a second torque to counteract a stress (5, 6) acting on the first and second touch panels by an operation of a user on the first and second touch panels. a first housing that comprises a first frame; a second housing that comprises a second frame; and hinges (51, 52) that couple the first frame and the second frame around a pivotal axis, wherein: the first frame comprises first supporting members (32, 33) each of which are provided on each end of the first frame in a direction of the pivotal axis and the first supporting members (32, 33) extend in a direction away from the pivotal axis, the second frame comprises a second supporting members (42, 43) each of which are provided on each end of the second frame in the direction of the pivotal axis and the second supporting members (42, 43) extend in a direction away from the pivotal axis, and the hinges (51, 52) are provided on each end of the first and second frames (30, 40) in the direction of the pivotal axis, each of the hinges (51, 52) provided on the outside of the first and second supporting members (32, 33, 42, 43) in the direction of the pivotal axis, the first frame comprises first supporting members (32, 33) each of which are provided on each end of the first frame in a direction of the pivotal axis and the first supporting members (32, 33) extend in a direction away from the pivotal axis, the second frame comprises a second supporting members (42, 43) each of which are provided on each end of the second frame in the direction of the pivotal axis and the second supporting members (42, 43) extend in a direction away from the pivotal axis, and the hinges (51, 52) are provided on each end of the first and second frames (30, 40) in the direction of the pivotal axis, each of the hinges (51, 52) provided on the outside of the first and second supporting members (32, 33, 42, 43) in the direction of the pivotal axis, the first housing comprises a first touch panel provided on a principal surface of the first housing, the second housing comprises a second touch panel provided on a principal surface of the second housing, the hinges (51, 52) couple the first and second housings (10, 20) in such a way as to allow the first and second housings (10, 20) to be in an opened state in which the principal surface of the first housing and the principal surface of the second housing are substantially on the same plane and in a closed state in which the principal surface of the first housing and the principal surface of the second housing face outwardly, and when the first and second housings (10, 20) are in the opened state, the hinges (51, 52) generate a torque being a sum of a first torque to counteract weights of the first and second housings (10, 20) and a second torque to counteract a stress (5, 6) acting on the first and second touch panels by an operation of a user on the first and second touch panels.