Tonoshō is a town and port in Shōzu District, Kagawa, Japan, with a population of 12,915. The town lies on the west coast of the island of Shōdoshima—the second-largest island in the Seto Inland Sea—and it is the main passenger access for the island. First settled around the 8th century, the town center grew into a complex maze of streets during the war-torn Muromachi period to inhibit enemy forces.