Kasumigaseki is a district in Chiyoda Ward in Tokyo, Japan. It is the location of most of Japan's cabinet ministry offices. The name is often used as a metonym for the Japanese government bureaucracy, while Nagatachō refers to the elected government or the legislative branch. Kasumigaseki Station was one of the stations affected during the Tokyo subway sarin attack.

Chiyoda , known as Chiyoda City in English, is a special ward of Tokyo, Japan. Located in the heart of Tokyo's 23 special wards, Chiyoda consists of the Imperial Palace and a surrounding radius of about a kilometer, and is known as the political and financial center of Japan. As of October 2020, the ward has a population of 66,680, and a population density of 5,709 people per km2, making it by far the least populated of the special wards. The total area is 11.66 km2, of which the Imperial Palace, Hibiya Park, National Museum of Modern Art, and Yasukuni Shrine take up approximately 2.6 km2, or 22% of the total area.