a microstructured separating device , especially for separating liquid components from a particle - containing liquid , comprising the following features : at least one transport channel for transport of the liquid in a given transport direction ; at least one separating area at a branch point of the transport channel which is adjoined by a side channel through which a partial flow of the liquid from the transport channel is diverted ; a microstructure in the separating area which keeps larger particles of the liquid out of the separating area and which slows down the transport of smaller particles in the separating area .