Ostracoda was found at Cimerang river, Sukabumi, West Java, Indonesia. Research area was part of Nyalindung member, Cimandiri Formation, and generally regarded as being of Miocene Age. This is the first research of ostracoda distribution in Miocene deposition in this area. The aims is to know the distribution of ostracoda based on measure section and micropaleontology analysis. Based on measure section, there are 9 stratigraphic unit where ostracoda was only found in 6 units of mudstone. From 6 units samples it is found about 19 species with 146 Individu which dominated with Keijela cariei, Hemicytheridea ornata, Cytherelloidea excavate. Ostracoda distribution revealed the paleoenvironment in research area is shallow marine.