This method for manufacturing a spring for a suspension device is characterized by including a molding step S10 for molding a steel member that contains, in mass%, C: 0.10-0.39%, Mn: 1.00-1.50%, and B: 0.0005-0.003% in hot or cold molding to a spring shape, and a quenching step S20 for carrying out quenching of the molded steel member using a medium having a heat transfer coefficient about equal to that of water or close to that of water, without the steel member subjected to quenching being tempered at 400°C or above.
