Nariaki Nakayama is a Japanese politician who has served as leader of Kibō no Tō from 2019 to 2021. He served as Minister of Education, Culture, Sports, Science and Technology in the Cabinet of Junich

Kosaka was born in the city of Nagano in Nagano Prefecture, on 12 March 1946. His father is Zentaro Kosaka, also a politician. Kenji Kosaka received a law degree from Keio University in 1968.