This collection was then the base of an exposition inaugurated on August 24, 1920, by President António José de Almeida, marking the centenary of the Liberal Revolution of 1820.

In 1977, the Revolutionary Council, created after the Carnation Revolution of 25 April 1974, legislated the founding of the Museu Militar do Porto.

After the proper adaptation of the building and installation of all the contents, the inauguration took place on 21 March 1980 by the President of the Republic, Ramalho Eanes.

The collection of miniature figures, displaying the evolution of soldiers since pre-history times till nowadays, is the museum's main attraction.

329 of the Rua do Heroísmo, at Bonfim parish, was initially destined to the habitation of D. Maria Coimbra, and was built by the end of the 19th century.