flat plate portion 261 to be perpendicular to the flat plate portion 261 and a u shaped plate portion 263 extending from an edge of the bottom plate portion 262 to be parallel to the flat plate portion 261 the u shaped plate portion 263 has two arms inserted into rectangular holes formed in the lens holder 22 the magnet 27 is fixed on a surface of the flat plate portion 261 of the yoke 26 which is faced to the u shaped plate portion 263 the objective lens driving apparatus is mounted to an optical base of an optical disk drive not shown to form an optical pickup the optical base is attached to a guide bar to be movable in a radial direction tracking direction tr of an optical disk 71 in fig7 and 8 introduced into the optical disk drive the optical base is provided with a laser diode an optical detector and a predetermined optical system a laser beam from a laser diode is irradiated through the objective lens 21 to the optical disk and a reflected beam reflected from the optical disk is directed to the optical detector by appropriately controlling an electric current supplied to each of the focusing coil 23 the tracking coils 24 and the tilting coils 25 wound on the lens holder 22 the lens holder 22 is tilted in the tracking direction tr rotated around a rotation axis parallel to a tangential direction tg moved in the tracking direction tr or moved in a focusing direction f in accordance with the relationship between each coil and magnetic fields produced by the yokes 26 and the magnets 27 next description will be made in detail about the arrangement of the lens holder 22 or the coils 23.