WEBMinistry of Land, Infrastructure, Transport and Tourism, Minister's Secretariat. Website. kantei.go.jp. The Naikaku Sōri Daijin Kantei (内閣総理大臣官邸) or Prime Minister's Office is the official workplace of the Prime Minister of Japan. It is commonly referred to as Shushō Kantei (首相官邸), or simply Kantei (官邸).