The hamlet Hertonäs is mentioned in the sources back in the Middle Ages. The manor's current main building was originally erected as a faience factory.
Later on, the manor has witnessed the dramatic destinies of the families Cronstedt and Bergbom. Vice admiral Carl Olof Cronstedt, who was accused of treason, passed away with bad reputation here in Hertonäs manor in 1820. Almost a hundred years later the red guards stormed the main building and shot the owner, John Bergbom, at his breakfast table.
Hertonäs manor has also been used as a scene for shooting many movies. Many well-known Finnish movies from the 20th century are filmed in the surroundings of the manor.
Nowadays Hertonäs manor is owned by the society Svenska Odlingens Vänner i Helsinge, who runs the manor's museum and Knusbacka farmstead here.