The four suits involving 1,650 plaintiffs were filed Monday, demanding the government and Tepco pay compensation and restore radiation exposure to pre-disaster levels, Jiji Press reported Tuesday.
The plaintiffs seeking damages estimated to be at least 5.36 billion yen (about $55.7 billion).
The lawsuits came as Japan marked the second anniversary of the monster earthquake and tsunami that triggered the nuclear crisis at Tepco's Fukushima No. 1 nuclear power plant in March 2011.
The plaintiffs are asking that the government and Tepco reduce radiation levels to those before the disaster and pay 50,000 yen (about $520) per person a month until the restoration is complete.