The first fair ground in Milan was opened in 1906, as the area of a World's fair, and in time for the opening of the Simplon Tunnel. The fairground at that time extended over the current area and the nearby Sempione Park.
In 1923 the fairground, at that time Fiera Campionaria, was moved permanently in the historical zone, of which Fieramilanocity now occupies a part. Western wing opened in 1997, in place of the old Alfa Romeo factory at Portello.
Since 2000, the infrastructure is managed by the new company Fiera Milano SpA and in 2005 the new Fieramilano opened in Rho. The old fairground in Milan was partially dismantled between 2007 and 2008.
