Ratified conventions by Japan
- 1953 - 2nd Geneva Convention For the Amelioration of the Condition of Wounded, Sick and Shipwrecked Members of Armed Forces at Sea
- 1953 - 3rd Geneva Convention Relative to the Treatment of Prisoners of War
- 1953 - 4th Geneva Convention relative to the protection of civilian persons in time of war
- 1953 - 1st Geneva Convention for the Amelioration of the Condition of the Wounded and Sick in Armed Forces in the Field
- 1979 - International Covenant on Economic, Social and Cultural Rights
- 1979 - International Covenant on Civil and Political Rights
- 1981 - Convention Relating to the Status of Refugees
- 1982 - Protocol Relating to the Status of Refugees
- 1985 - Convention on the Elimination of all Forms of Discrimination against Women
- 1994 - Convention on the Rights of the Child
- 1995 - Convention on the Prohibition of the development, production, stockpilling and use of chemical weapons
- 1995 - International Convention of the Elimination of All Forms of Racial Discrimination
- 1998 - Convention on the Prohibition of the Use, Stockpilling, production and transfer and antipersonnel mines
- 1999 - Convention against Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment
- 2004 - Optional Protocol on the Involvement of Children in Armed Conflict
- 2004 - Additional Protocol Relating to the Protection of Victims of Non-International Armed Conflicts
- 2004 - Additional Protocol Relating to the Protection of Victims of International Armed Conflicts
- 2005 - Optional Protocol on the Sale of Children, Child Prostitution, and Child Pornography
- 2007 - Statute of the International Criminal Court
- 2009 - International Convention for the Protection of All Persons from Enforced Disappearance
- 2009 - Convention on Cluster Munitions