Nipponopius glabricaudatus sp. n. from Shaanxi and Ningxia (NW China) is described and illustrated (Hymenoptera: Braconidae: Opiinae). A key to the species of Nipponopius Fischer, 1963, is added and for the first time the male is described and illustrated. The genus is reported for the second time from outside Japan and is new for China. The position of Nipponopius Fischer is discussed and it is accepted as a valid genus.