Female happiness has been paradoxically declining over recent decades in reverse proportion to expanding opportunities for women in developed countries, but this subject has not been explored in Japan. Using JGSS, we found that Japanese women have been slightly happier in both absolute and relative terms to men in the 2000s. While happiness of men aged 35–49 and 65 and over temporarily declined in the first half of the decade, women in age groups 20–34 and 65 and over gained happiness in the second half. Moreover, trends in life satisfaction in terms of economic aspects are similar for men and women, slightly advantageous to men in marriage, and largely advantageous to women in non‐market and non‐family aspects.