MOSCOW — Russian lawmakers on Wednesday moved to decriminalize some forms of domestic battery for first-time offenders who do not do serious physical harm to their victims.

Members of the State Duma passed the controversial amendment to the Russian criminal code in its second reading, which essentially assures it will go to President Vladimir V. Putin for his signature.

The amendment treats a first conviction for domestic battery as an administrative offense, carrying a penalty of a $500 fine or 15 days in jail. If Mr. Putin signs the measure into law, only injuries like concussions or broken bones, or repeated offenses committed in a family setting, would lead to criminal charges.

Defenders of the measure say it will protect parents’ rights to discipline their children and generally reduce the state’s role in domestic life.