Tokyo 6th district is a constituency of the House of Representatives in the Diet of Japan (national legislature). It is located in Tokyo, and consists of major parts of the City of Setagaya, one of Tokyo's 23 special wards. With 2.18 times as many voters as Tokushima's 1st district, it had the lowest electoral weight throughout Japan in the election of 2005. In 2007 the Supreme Court dismissed a claim that the election in this and other Tokyo districts was unconstitutional and thus invalid. As of September 2012, 486,353 eligible voters were registered in the district, giving them the third lowest electoral weight in the country.