The present invention aims at producing polyamide flat cross-section fibers of high flatness, and it is an object of the present invention to provide a polyamide-based multifilament having a flat polyamide-based multifilament by using a slit- And the temperature of the lower portion of the lower portion within 20 cm immediately after discharge is kept at a temperature higher than the melting point and lower than the melting point + 50 ° C. According to this, even with a low cadmium discharge area, The cross-sectional fibers can be produced with stable operability.
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