A window regulator to be disposed in a vehicle comprises: a first frame disposed on one side of the longitudinal direction of a door and extending in the directions for a door glass to go up and down; a second frame disposed on the other side of the longitudinal direction of the door and extending in the upward and downward directions of the door glass; an upper frame disposed to span the upper portion of the first frame and the upper portion of the second frame; a wire tensed in an annular shape along the first frame, the upper frame and the second frame and having a return portion for a backward run in the first frame; a first wire fixing member disposed on one side of the longitudinal direction of the door glass and retained by the return portion of the wire to move along the first frame; a second wire fixing member disposed on the other side of the longitudinal direction of the door glass and retained by the wire portion to move along the second frame; and a drum disposed on the inner side of the door panel of the door and wound with a portion of the wire for moving the annularly tensed wire back and forth when it is turned.