The Social Democratic Party of Finland (, SDP, colloquially demarit; ) is one of the four major political parties in Finland, along with the National Coalition Party, The Finns Party and the Centre Party. Antti Rinne is the party's current chair. The party has been represented in the Finnish cabinet for long periods, and has set many fundamental policies of the Finnish state. The party is currently in the opposition. The party's ideology is social democracy. The SDP has a close relationship with the Central Organisation of Finnish Trade Unions (SAK), and is a member of the Socialist International and the Party of European Socialists.