伊豆箱根鉄道
After the Meiji Restoration, the establishment of the modern municipalities system created Minamiashigara, Fukusawa, Okamoto and Kitaashigara villages within Ashigarakami District, Kanagawa Prefecture. The development of the area was spurred by the opening of the Oyama Mountain Railway (present-day Izuhakone Railway Daiyūzan Line) on October 15, 1925. Minamiashigara was elevated in status to that of a town on April 1, 1940, and annexed neighboring Fukusawa, Okamoto and Kitaashigara villages in 1955. It was elevated to city status on April 1, 1972.