長田紘一郎

Koichiro Osada is a Japanese politician currently serving as a member of the House of Representatives. Born in 1999 in Tokyo, he completed his graduate studies at Waseda University. Before entering national politics, he worked as a secretary to House of Representatives member Goshi Hosono. In the 51st general election held in February 2026, Osada was elected to the House of Representatives representing the Tokai proportional representation block as a candidate for the Liberal Democratic Party. At the time of his election, he was 26 years and 3 months old, making him the second youngest member elected in that cycle.