Six species of the sesarmid crab genus "Neosarmatium" Seréne and Soh, 1970 has been recorded in Taiwan previously. One additional species, "N. leave" (A. Milne-Edwards, 1869) is newly recorded in present study. The species is similar to "N. indicum" in life color, but differs by the morphology of carapace and male cheliped and mature size. The morphology, distribution, ecological notes are provided. A key to all seven species occurred in Taiwan is also provided.