PURPOSE: To simultaneously hide both of an electrical wire and a hinge mechanism by a cylindrical body by inserting the line connecting electrically between an electronic equipment main body and a rotation equipment in the cylindrical body provided on the outer peripheral part of the hinge mechanism in the direction vertical to the axis line.

CONSTITUTION: A pair of right and left hinge mechanisms 6 are arranged in a symmetrical to the center line form on the same axis line within a pair of right and left projecting parts 20 and cylindrical bodies 21 on the same axis line is freely rotatably fitted to the outer peripheral part of the sleeve 66 of each hinge mechanism 6 within a fixed angle. By these cylindrical bodies 21, the peripheral part of each hinge mechanism 6 is covered. On the upper and lower sides of this peripheral part, electrical wire insertion holes 22, 23 are formed. A pair of projecting pieces 24, 25 on the lower side are idle-fitted within the small electrical wire insertion hole 26 of a recessed part 19. Each flat cable 7a is made to be inserted into electrical wire insertion holes 23, 26 by detouring the peripheral part of the sleeve 66 within the cylindrical bodies 21 from the electrical wire insertion hole 22 and each flat cable 7a is inserted in the recessed and projecting parts 19, 20 in the direction vertical to the axis line.