A method of manufacturing a toner for developing static charges in an
aqueous system is provided which includes preparation step for a resin
kneaded product, preparation step for the aqueous dispersion of a less
water-soluble alkaline earth metal salt, preparation step for synthetic
resin particles, removal step for the less water-soluble alkaline earth
metal salt, and separation-cleaning-drying step. At preparation step S3
for synthetic resin, an ionic material for decomposing the less
water-soluble alkaline earth metal salt is admixed with a mixture of the
resin kneaded product and the aqueous dispersion of the less
water-soluble alkaline earth metal salt.