Ryutaro Hashimoto
Jinnouchi worked as a bureaucrat in the construction ministry. He was a member of the LDP and was first part of the faction headed by Keizo Obuchi. He then joined the faction led by Ryutaro Hashimoto in the party. Jinnouchi served in the Upper House for the LDP for three terms. He held the post of the parliamentary vice minister for agriculture, forestry, and fisheries.