The invention relates to an optical disc apparatus more particularly relates to an optical disc apparatus which is suitably applied to an magneto-optic disc apparatus to reduce leakage of wobble signal to reproduction signal. To achieve the object, the signal level of the first and second beam quantity detection signals SI and SJ which generate the reproduction signal RF by use of the differential output is corrected based on the signal level SL of the wobble signal component detected from the reproduction signal RF and the phase detection result S.o slashed., or the wobble signal component is extracted respectively from the first and second beam quantity detection signals and subtraction is performed.