An information reproducing method for reproducing information recorded on an optical disk (107), wherein light from a semiconductor laser (101) is converged as at least one focused spot on the optical disk. The light is reflected as a plurality of reflected light beams the polarities of the intensity distributions of which are mutually in a substantially inverted relationship with each other when the focused spot crosses a track of the optical disk. The reflected beams are detected and their respective focus error signals are added to obtain a focus error signal, and their respective tracking error signals are subtracted to obtain a tracking error signal. The optical disk has a groove width equal to substantially one half of its track pitch. The tracking error signals may be amplified by a gain proportional to a ratio between reciprocals of respective total amounts of light reflected by the plurality of reflected beams.