in lens actuator 1002 height 118 r of inner yoke 118 in the direction of center axis 1001 m is equal to height 119 r of outer yokes 119 in the direction this structure does not produce magnetic field m 2 in the slanting direction shown in fig3 therefore a large magnetic field is produced between inner yoke 118 and outer yokes 119 accordingly causing coil 17 and carrier 11 to move with a large force fig5 a is a partially enlarged view of still another lens actuator 1003 according to the embodiment in fig5 a the same components as those of lens actuator 1001 shown in fig1 to 3 are denoted by the same reference numerals and their description will be omitted lens actuator 1003 includes inner yoke 218 and outer yokes 219 instead of inner yoke 118 and outer yokes 119 of lens actuator 1001 shown in fig3 no portion of magnets 20 are positioned between coil 17 and inner yoke 218 no portion of magnets 20 are positioned between coil 17 and outer yokes 219 inner yoke 218 has inner circumferential surface 218 a and outer circumferential surface 218 b opposite to inner circumferential surface 218 a each of outer yokes 219 has inner circumferential surface 219 a and outer circumferential surface 219 b opposite to inner circumferential.