Abstract: A flow meter, especially for measuring fluid flow passing through large-diameter conduits, in which a rod-shaped vortex generating body is built in a conduit section in a direction transverse to the fluid stream passing therethrough and in which Karman vortices detach themselves, the frequency of which, which is measured by feeler elements, corresponds to the speed of the fluid passing through the conduit. In order to assure that the aforementioned vortices detach themselves uniformly over the whole length of the vortex generating body even if the flow meter is built into a conduit of large diameter, the tube section is divided by at least one thin dividing wall into two vortex chambers. The vortex generating body is arranged normal to the aforementioned dividing wall, and the feeler elements for the sensing of the vortex frequency are arranged in one of the vortex chambers.