In 1997, the former Economic Planning Agency implemented the first official monetary evaluation of unpaid work. At that time, in Japan, wages were worked out on the basis of gender as well as age; simply put, valuation amounts of unpaid worker varied by gender. In this study, the loss of income for women was impartially calculated. In other words, the unpaid wage differentials by gender were excluded when our trial calculation was made for women on the basis of the second report compiled by he former EPA in 1998. Our calculation yielded approximately 168, 080 billion yen or 33.6% of GDP. The general comment price of unpaid work became 10.4% or 52 trillion yen higher than figure listed in the 1998 EPA report. The rate of women's valuation amount to the total naturally increased from 84.5% to 89.3%. Furthermore, our research uncovered the lopsidedness between men and women in terms of annual valuation amounts per capita, and clarified the content of actions involving unpaid work which was not specified in the EPA report. There is a need to recognize publicly that the unpaid work is just as worthy as the paid work, and some policy or social system should be immediately established to enable to choose and distribute unpaid work in our lifestyle irrespective of gender difference.