An attachment structure for fastening a rectangular plane display unit to a housing of a portable type computer, the attachment structure comprising side fixing members being fixable to left and right edge surfaces of the plane display unit and to the housing with screws, wherein: the attachment structure comprises an upper center fixing member formed of a metallic plate and having a proximal portion comprising a pair of screw-inserting holes at opposite ends of the proximal portion, a hook portion in a central area of the upper center fixing member and a pair of claws, the hook portion being bent to be at a right angle from the proximal portion and the claws being formed between the hook portion and the screw-inserting holes by being bent to be at a right angle from the hook portion, the proximal portion being fixable to the housing parallel to a bottom surface of the housing and extending parallel to an upper edge surface of the plane display unit; the attachment structure comprises sheets fixable to the housing and wherein, when the plane display unit is fastened to the housing, a rear surface of the plane display unit at an upper central edge is in contact with the sheets and a front surface of the plane display unit at the upper central edge is in contact with the claws so that the plane display unit at the upper central edge is fixed between the sheets and the claws in a sandwiched manner; and the hook portion is engageable through an opening formed in the upper center fixing member with a claw provided in a main body of the portable type computer when a display of the portable type computer comprising the plane display unit is closed relative to the main body, the display being openable/closable relative to the main body by being rotatable about a hinge of the portable type computer, the hinge being located at an opposite side to the upper central edge. the attachment structure comprises an upper center fixing member formed of a metallic plate and having a proximal portion comprising a pair of screw-inserting holes at opposite ends of the proximal portion, a hook portion in a central area of the upper center fixing member and a pair of claws, the hook portion being bent to be at a right angle from the proximal portion and the claws being formed between the hook portion and the screw-inserting holes by being bent to be at a right angle from the hook portion, the proximal portion being fixable to the housing parallel to a bottom surface of the housing and extending parallel to an upper edge surface of the plane display unit; the attachment structure comprises sheets fixable to the housing and wherein, when the plane display unit is fastened to the housing, a rear surface of the plane display unit at an upper central edge is in contact with the sheets and a front surface of the plane display unit at the upper central edge is in contact with the claws so that the plane display unit at the upper central edge is fixed between the sheets and the claws in a sandwiched manner; and the hook portion is engageable through an opening formed in the upper center fixing member with a claw provided in a main body of the portable type computer when a display of the portable type computer comprising the plane display unit is closed relative to the main body, the display being openable/closable relative to the main body by being rotatable about a hinge of the portable type computer, the hinge being located at an opposite side to the upper central edge.