にっぽんしゃかいとう 日本社会党 LinksSentence search for 日本社会党Sentence search for にっぽんしゃかいとうSentence search for にほんしゃかいとうKanji details for 日, 本, 社, 会 and 党Edit in JMdict Noun1. Japan Socialist Party (1945-1996; succeeded by the Social Democratic Party of Japan); JSPHistorical term, See also 社会民主党Other forms日本社会党 【にほんしゃかいとう】 Discussions Log in to talk about this word.