Nairobi is the capital city of Kenya and one of the most important economic centres in East and Central Africa. Urban problems have been left unsolved and are causing negative impacts like perennial traffic congestion, expansion of slum areas, insecurity, poor urban governance, and environmental deterioration. In order to accelerate sound and sustainable development, an integrated urban master plan was prepared to improve infrastructure such as transport network, water supply, sewerage reticulation energy, etc. In response to the request of the Government of Kenya, the Government of Japan dispatched a Study Team for the Integrated Urban Development Master Plan for the City of Nairobi. The objective is to review and develop concepts on sustainable urban development and improvement of living conditions based on an integrated urban development plan for Nairobi City.