 The party was founded by Abraham Staalman who had previously been member of the liberal Liberal State Party (LSP) after his own Middle Class Party had merged into that.Before the elections of 1929 Staalman had founded his own party and had left the LSP parliamentary party.The Middle Party entered in the 1929 elections, who held a personality-based campaign around the Bussum milk industrial and anti-toll campaigner Floris Vos.