Japan Enacts Joint Custody Law

Japan has enacted a major amendment to its Civil Code that allows divorced parents to pursue joint custody of their children, with the change taking effect Wednesday. The revision gives former spouses the option to agree on either joint or sole custody, replacing a long-standing framework that required custody to be assigned to only one parent after divorce.

Officials and supporters have described the shift as the first substantial overhaul of Japan’s child-rearing legal structure in more than a century. Under the previous rules, one parent became the sole legal custodian, a model that drew criticism for limiting the non-custodial parent’s role and for concerns about the psychological effects on children when contact with one parent diminishes or ends.

The new law is designed to let parents negotiate arrangements that keep both involved, including participation in decisions such as schooling and healthcare. If parents cannot reach an agreement, family courts will decide custody disputes, a feature that has also become a focal point for critics who argue the revision increases the courts’ influence over family outcomes.

The legislation also includes a pathway for families affected by earlier divorces. For divorces finalized before April 1, parents may petition a family court to seek changes to existing sole-custody arrangements, allowing them to request a different structure under the updated rules.

Data cited from the health ministry illustrates how custody outcomes looked under the prior system. In 2020, mothers were awarded custody in 85% of cases, reflecting how sole-custody rules typically resulted in one parent—most often the mother—becoming the only legal custodian.

Supporters say the reform addresses a recurring concern that the former approach often led to non-custodial parents losing contact with their children. They also point to Japan’s position among advanced economies: most other G7 countries commonly recognize joint custody, and the change brings Japan’s legal options closer to that prevailing model.

Critics, however, have raised risks they believe could emerge in practice. Some argue that joint custody could be used by abusive former spouses to maintain access to a former partner or child, even though the law includes provisions that prevent joint custody when abuse is a factor. Others question how consistently those safeguards will be applied and emphasize that court involvement could become decisive when parents disagree.

The stakes are significant given the scale of family change in Japan. About 200,000 children are affected by divorce each year, meaning the new custody choices and court processes could shape outcomes for a large number of households as the system transitions from mandatory sole custody to a model that permits joint arrangements.