Polyamide fiber for airbag and method for producing same

Provided is a polyamide fiber with which it is possible to suppress wrinkles of a woven fabric for an airbag after heat shrinkage and to suppress variations in air permeability characteristics due to an improvement in uniformity. The present invention relates to a polyamide fiber for an airbag characterized in that the fiber has a fineness of 200-800 dtex (inclusive) and a stress retention rate of 3.0% or more as determined by a predetermined step, and a method for manufacturing the polyamide fiber for an airbag characterized in that the fiber has a fineness of 200-800 dtex (inclusive) and a stress retention rate of 3.0% or more as determined by a predetermined step. In the heat setting step and the relaxation step, the contact time between a roller reaching 190 DEG C or more and the strand is 30 msec or more and less than 110 msec, the temperature of the heat setting roller is 190 DEG C or more and 205 DEG C or less, the temperature of the relaxation roller is more than 100 DEG C and less than 190 DEG C, and