<P> Several political parties exist in Japan , however , the politics of Japan have primarily been dominated by the LDP since 1955 , with the DPJ playing an important role as opposition several times . LDP was a ruling party during decades since 1955 . Despite of existence of multiple parties , other parties were completely ignored . Most of the prime ministers were elected from inner factions of LDP . </P>
which political party has dominated japanese politics since the end of world war ii
the LDP