Östermalmstorg metro station is station on the red line of the Stockholm metro, located in the district of Östermalm. The station was opened on 16 May 1965 as the 59th station in the Stockholm system as the north terminus of the extension from T-Centralen. On 2 September 1967, the line was extended northeast to Ropsten. On 30 September 1973, another extension, north to Tekniska högskolan, was opened. The platform is approximately 38 metres (125 ft) below the surface. It is located in the city center, making it one of the most-used stations in the system, with approximately 38,550 people travelling from the station on an average workday.