The SPJ was formed on 10 April 2010 by five Japanese lawmakers and parliamentarians, four former members of the Liberal Democratic Party (LDP) and an independent politician.
PMTJ dibentuk pada 10 April 2010 oleh lima legislator dan anggota parlemen Jepang, empat mantan anggota Partai Demokratik Liberal (PDL) dan seorang politikus independen.