A recording power adjusting method is proposed wherein the optimum recording power can be set with a high degree of precision. There are also proposed an information recording method and an optical information recording medium. A plurality of types of recording powers Pw and m (where m is a whole number) are used to perform trial writings, and modulation factors M and m corresponding to the recording powers Pw and m are calculated. A reference asymptotic power Pasy-ref and a reference recording start power Pws-ref, which are specified in advance for each of a plurality of media, are used to perform predetermined calculations, thereby calculating the optimum asymptotic power Pasy-opt. This optimum asymptotic power Pasy-opt is used to calculate evaluation values S, m=M, mx (Pw, m-Pasy-opt). A recording power Pw, for which the evaluation value S is zero when the relationship between the recording powers Pw and m and the evaluation values S and m is linearly approximated, is calculated as the optimum recording start power Pws-opt. This optimum recording start power Pws-opt is then subjected to a predetermined calculation process, thereby determining the optimum recording power Pw-opt.