The various reformations of 90's Japan are often summarized as "From equality of result to equality of opportunity". However, the cause and implication of this change are not sufficiently made clear. On statistical data, the improvement of equality, both of result and of opportunity, has been stagnant since 80's. So the reformation in 90's was not caused by excess of the equality of result, but this stagnation itself caused the change of the principle of equality. In this paper, with re-examination of the concept of "opportunity", we show how this change is related to the new phase of 90's Japan, such as stagnation of equalization, sustainable society, and privatization.
