the present invention relates to an amplifying circuit that can change load drivability responding to load conditions , and reduce power consumption . the amplifying circuit according to the present invention comprises an amplifying means that amplifies input signals a first time to generate a first and a second amplified signals through a first and a second transistors , and further amplifies the first and second amplified signals once again through a third and a fourth transistors , for final outputs ; a detecting means for detecting the first and second amplified signals from the amplifying means and generating a first and a second detection signals ; and a load drivability control means that is controlled by the first and second detection signals from the detecting means to change load drivability of the amplifying means .