Shikine-jima (式根島) is a volcanic Japanese island in the Philippine Sea. The island is administered by Tōkyō and located approximately 160 kilometres (99 mi) south of Tōkyō and 36 kilometres (22 mi) south of Shimoda Shizuoka Prefecture. It is one of the Izu Seven Islands group of the seven northern islands of the Izu archipelago. The island is the smaller inhabited component of the village of Niijima, which also contains the larger, neighboring island of Niijima and the smaller, uninhabited Jinaitō. It is part of the Ōshima Subprefecture of Tokyo Metropolis.