an optical pick-up head including:

a light source emitting a light beam;

a condensing unit receiving a beam from the light source and condensing the beam onto an optical recording medium;

a beam splitter receiving the beam reflected from the optical recording medium and splitting the beam; and

a photodetector receiving the beams split by the beam splitter and outputting signals in accordance with amounts of the received light beams;

wherein the photodetector has a plurality of light-receiving portions, and a tracking error signal generator generating a tracking error signal for irradiating a desired track with a beam,

wherein the optical recording medium has tracks arranged substantially at a constant pitch,

an average of the pitch is tp,

the beams are received by the plurality of light-receiving portions, and

the tracking error signal generator performs a differential arithmetic operation with respect to the signals output from the light-receiving portions to generate a push-pull signal, and in a case where an amplitude of the push-pull signal, obtained at a pitch tp when the light beam is scanned in a direction orthogonal to the tracks of the optical recording medium, is changed at a pitch different from the pitch tp, the push-pull signal is obtained by an arithmetic operation (I1-I2)-k(I3-I4) where I1 to I4 are the outputs from four light-receiving portions receiving the beams and k is a real number.