The Daiyūzan Line (大雄山線, Daiyūzan-sen) is a commuter railway line in Kanagawa Prefecture, Japan, operated by the private railway operator Izuhakone Railway.

The line connects Odawara Station in the city of Odawara with the Daiyūzan Station in the city of Minamiashigara.

As of April 1, 2016[update], the line is operated using a fleet of seven three-car 5000 series electric multiple unit (EMU) trainsets.

[1] The line opened on October 15, 1925, as the Daiyūzan Railway, between Kari-Odawara Station (仮小田原駅) and Daiyūzan Station, with a track gauge of 1,067 mm (3 ft 6 in) and an overhead power supply of 600 V.[2] The terminus of the line was moved from Kari-Odawara to Shin-Odawara Station (新小田原駅), close to the present-day Midorichō Station on April 10, 1927, and finally to Odawara Station on June 16, 1935.

[2] Automatic ticket gates were installed on all stations by 2003,[citation needed] and were upgraded to accept both the Suica and PASMO IC Card systems by March 2007.