A portable terminal, comprising: a first body having a first display surface and a second body having a second display surface, which first body and second body are jointed through a hinge unit in a foldable way, and which first display surface and second display surface form one combined display continuously in the open state of said first body and said second body; and a display control unit adapted to display information throughout said combined display, wherein said hinge unit is positioned at back surfaces of said combined display in said first body and said second body in the open state of said first body and said second body, characterized in that said hinge unit comprises a first shaft member set in said first body, a second shaft member set in said second body, and a link member whose both ends are connected to said first shaft member and said second shaft member in a rotatable way, wherein a surface of the link member is substantially flat with the lateral surfaces of said first body and said second body in the folded state and is substantially flat with the back surfaces of said first body and said second body in the open state, said hinge unit further comprises a first fixing block which is fixed to the first body for supporting the both ends of the first shaft member in a rotatable way and a second fixing block which is fixed to the second body for supporting the both ends of the second shaft member in a rotatable way, each of the first and the second fixing blocks has a disc portion with a through hole for penetrating the first and second shaft members and a plate portion which is integrally formed to be orthogonal to the disc portion, flat portions with one of the outer periphery cut away are formed at the both ends of each of the first and second shaft members, in pairs symmetrically around the shaft center and the respective flat portions at the both ends of each of the first and the second shaft members are formed deviated from each other by 90 degree angle around the shaft in an orthogonal way, a pair of restrictive projections are formed symmetrically around the shaft center in an inner periphery of the through-hole of the first and the second fixing block, the first and the second shaft members are in contact with the respective inner peripheral surfaces of the respective through holes in a slidable way at assembly time, which allows the rotation in two directions until the flat portions abut against the respective pairs of the restrictive projections. a first body having a first display surface and a second body having a second display surface, which first body and second body are jointed through a hinge unit in a foldable way, and which first display surface and second display surface form one combined display continuously in the open state of said first body and said second body; and a display control unit adapted to display information throughout said combined display, wherein said hinge unit is positioned at back surfaces of said combined display in said first body and said second body in the open state of said first body and said second body, characterized in that said hinge unit comprises a first shaft member set in said first body, a second shaft member set in said second body, and a link member whose both ends are connected to said first shaft member and said second shaft member in a rotatable way, wherein a surface of the link member is substantially flat with the lateral surfaces of said first body and said second body in the folded state and is substantially flat with the back surfaces of said first body and said second body in the open state, said hinge unit further comprises a first fixing block which is fixed to the first body for supporting the both ends of the first shaft member in a rotatable way and a second fixing block which is fixed to the second body for supporting the both ends of the second shaft member in a rotatable way, each of the first and the second fixing blocks has a disc portion with a through hole for penetrating the first and second shaft members and a plate portion which is integrally formed to be orthogonal to the disc portion, flat portions with one of the outer periphery cut away are formed at the both ends of each of the first and second shaft members, in pairs symmetrically around the shaft center and the respective flat portions at the both ends of each of the first and the second shaft members are formed deviated from each other by 90 degree angle around the shaft in an orthogonal way, a pair of restrictive projections are formed symmetrically around the shaft center in an inner periphery of the through-hole of the first and the second fixing block, the first and the second shaft members are in contact with the respective inner peripheral surfaces of the respective through holes in a slidable way at assembly time, which allows the rotation in two directions until the flat portions abut against the respective pairs of the restrictive projections.