A power adjustment method whereby a modulation index is calculated from 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 {TAIL ~ irradiation light} is set up using {HEAD ~ the modulation index}, the power adjustment method comprising: 
A power adjustment method whereby a modulation index is calculated from 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 { TAIL ~ irradiation light } is set up using { HEAD ~ the modulation index } , the power adjustment method comprising :
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