PURPOSE: To enlarge the filtration area of a filter, by disposing a honeycomb structure between a flow straightening plate and a filter above a spinneret plate.

CONSTITUTION: A flow straightening plate 3 is disposed on a flange 2a of a spinneret plate 2 and a honeycomb structure 7 in which plates 6 are assembled into a grating state is disposed on the flow straightening plate 3. A filter 4 is disposed on the honeycomb structure 7. Thus, the apparatus permits a reduction in the dead space of the filter 4, an increase in the filtration area of the filter and an improvement in the filtration efficiency of a spinning solution.