A power adjustment method whereby {HEAD ~ a modulation index} is calculated from {TAIL ~ reproduced signals} of patterns recorded by irradiating light onto an optical information recording medium with a recording power varied and for which an optimum power of irradiation light is set up using the modulation index, the power adjustment method comprising: 
is calculated from
A power adjustment method whereby { HEAD ~ a modulation index } is calculated from { TAIL ~ reproduced signals } of patterns recorded by irradiating light onto an optical information recording medium with a recording power varied and for which an optimum power of irradiation light is set up using the modulation index , the power adjustment method comprising :
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