Toi is a town located in Tagata District, Shizuoka Prefecture, Japan on the west coast of Izu Peninsula facing Suruga Bay. As of March 1, 2004, final population data before the amalgamation, the town had an estimated population of 5,203 and a density of 105 persons per km2. On April 1, 2004, Toi, along with the towns of Amagiyugashima, Nakaizu and Shuzenji, was merged to create the city of Izu.