The Haunted Story of Saruo Tunnel

In the quiet farmland of Sanmu City, Chiba Prefecture, an unremarkable stretch of prefectural highway passes through a short, orange-lit tunnel called Saruo Tunnel. By day it's simply part of the commute between rural hamlets. After dark, it's considered one of Chiba's most talked-about haunted spots.

The Real History

Saruo Tunnel is a real, currently active roadway tunnel located in the Saruo area of Matsuo-machi, within present-day Sanmu City, Chiba Prefecture. According to available road records, the tunnel is approximately 265 meters long, 6.5 meters wide, and 4.5 meters high, and it carries Chiba Prefectural Road 22 (the Chiba–Yachimata–Yokoshiba Line), completed in October 1986 (Shōwa 61). This makes Saruo Tunnel considerably newer than many of Japan's famous “haunted tunnels,” most of which date to the Meiji or early Shōwa eras and were built for foot or rail traffic before being converted or abandoned.

Because the tunnel is a modern, purpose-built road tunnel rather than a repurposed mining or railway bore, there is no documented history of wartime labor, mining disaster, or large-scale construction accident associated with it — unlike many of the older tunnels that populate Japan's ghost-story circuit. What is well documented locally is the immediate surroundings: an old cemetery sits on the hillside directly above the tunnel, reachable by a road nearby nicknamed “Inugoroshi-zaka” (literally “dog-killing slope”), and this cemetery's proximity to the tunnel is the detail most consistently cited as the root of its haunted reputation, rather than any incident during the tunnel's own construction or operation.

The Haunting

Saruo Tunnel's ghost stories are unusually varied even by the standards of Japanese tunnel folklore. The most frequently repeated tale describes the apparition of a headless figure, sometimes identified as a soldier, said to wander the tunnel's interior, with sightings reported mostly at night. A second, separate legend involves a stain on the tunnel wall resembling the silhouette of a pregnant woman; locals say that around midnight the stain is said to give rise to a woman's spirit accompanied by a high-pitched scream. A third and more unusual phenomenon reported by visitors involves car radios: drivers passing through claim that whatever song is playing abruptly cuts out and is replaced by old Shōwa-era enka or folk music, as though someone — or something — were retuning the dial. Local ghost-spot sites consistently trace all of this back to the cemetery on the hill directly overhead, describing the tunnel as a kind of passageway the dead are drawn toward.

Can You Visit?

Saruo Tunnel is a fully open, in-use public road tunnel on Chiba Prefectural Road 22, so it can be driven or walked through legally at any time, unlike many of Japan's abandoned haunted tunnels. Visitors should nonetheless be respectful of the adjacent cemetery and mindful that this is an active roadway with real traffic, not a designated tourist site.