The chief cabinet secretary of Japan is a member of the cabinet and is the leader and chief executive of the Cabinet Secretariat of Japan. The chief cabinet secretary coordinates the policies of ministries and agencies in the executive branch, and also serves as the government's press secretary. The secretary is a statutory member of the National Security Council, and is appointed by the emperor upon the nomination by the prime minister. The chief cabinet secretary is the first in line of succession to the prime minister, unless the office of the deputy prime minister is occupied.

The Cabinet of Japan is the chief executive body of the government of Japan. It consists of the prime minister, who is appointed by the emperor after being nominated by the National Diet, in addition to up to nineteen other members, called ministers of state.