The invention is a magnetic head gimbal assembly, comprising: magnetic head; microdriver with two film piezoelectric pieces, which define a notch; suspension to bear the magnetic head and the microdriver, where the suspension comprises: flexible piece with driver bearing part and magnetic head bearing part to partially hold the magnetic head, where the driver bearing part has a slot correspondingto the notch of the microdriver; and load beam with first and second salient points, where the first salient point supports the flexible piece in a corresponding position to the central region of themagnetic head and the second salient point runs through the slot on the flexible piece and the notch of the microdriver and extends to the end of the front edge of the magnetic head and a gap forms between the magnetic head and the salient point. And the invention discloses a disk driving unit comprising the improved magnetic head gimbal assembly.