Nacka Municipality (Nacka kommun) is a municipality in Stockholm County in east central Sweden. Its seat is located at Nacka. The municipality is situated just east of the capital Stockholm and the western parts are considered a suburban part of the city of Stockholm.The present municipality was created in 1971 when the City of Nacka (itself instituted in 1949) was amalgamated with Saltsjöbaden (itself detached from "old" Nacka in 1909) and Boo.