Couples cope with their stress as a unit rather than two isolated individuals. Couples coping were well examined by the Dyadic Coping Inventory (DCI) in European and American population, but not in Asian population. We aim to examine the applicability of DCI in Japanese married couples. Participants were 44 heterosexual couples in Japan. They answered the DCI and marital satisfaction. Results supported the applicability of DCI generally and showed several partner effects. The partner effects of DCI were discussed from the perspective of perceived social support.