An information recording apparatus (1) is provided with: a recording device (11) for recording a data pattern onto a recording medium (100); a reading device (11) for reading the data pattern, thereby obtaining a read
signal; an amplitude limit filtering device (15) for limiting an amplitude level of the read
signal by using a predetermined amplitude
limit value, thereby obtaining an amplitude limit
signal and for performing a
high frequency emphasis filtering process on the amplitude limit signal, thereby obtaining an
equalization-corrected signal;a measuring device (19) for measuring
jitter of the
equalization-corrected signal or the read signal; a detecting device (20) for detecting the data pattern of the
equalization-corrected signal; and an adjusting device (21) for adjusting a recording condition such that the
jitter satisfies a desired condition, with reference to the data pattern.