The present disclosure has been worked out to provide a buffer circuit and a control method thereof capable of controlling the timing at which the output switching element is changed from an OFF state to an ON state, and preventing the output characteristic from becoming unstable. The buffer circuit includes: a driving portion 20 driving output switching elements M1 and M2; a detecting portion 30 detecting that the voltage values of control terminals of the output switching elements M1 and M2 have exceeded the threshold voltage value; an auxiliary driving portion 40 being connected to the driving portion 20 and changing driving capability of the output switching elements M1 and M2 in accordance with the result of detection by the detecting portion 30.