A suspension assembly of an actuator for a disk drive to support a slider, on which a read/write head is mounted, elastically biased toward a surface of a disk. The suspension assembly includes: a load beam coupled to an end of a swing arm of the actuator; a flexure supporting the slider and having a fixed end fixed to a surface of the load beam facing the disk and a free end disposed close to a leading end of the load beam; an extender extending from the free end of the flexure; and a limiter limiting a range of up and down vibrations of the extender.