the invention relates to an operating fluid container for a motor vehicle , said container including a container body which is assembled from at least two injection - molded shells of thermoplastic plastics material which are complementary to each other . the shells are provided in each case with integrally molded structures which extend into the free container volume in such a manner that they bring about a restriction of a fluid surge created , for instance , in the container . at least some of the structures on each of the two shells are welded together at least in part or in a punctiform manner approximately in the joining plane of the container .