A producing process of amino resin crosslinked particles includes the step of curing an emulsion of an amino resin precursor and an emulsifier in the presence of a catalyst, the amino resin precursor being a product of a reaction of an amino compound with formaldehyde, so as to prepare amino resin particles, the step of neutralizing the suspension of the amino resin particles after the curing step, and the step of heating the suspension in a temperature range of 130.degree. C. to 230.degree. C. after the neutralizing step. The amino resin crosslinked particles thus prepared by the condensation of the amino compound and formaldehyde generate formaldehyde in an amount of not more than 1000 ppm in a pyrolysis test and have a characteristic that a Hunter whiteness is not less than 85 percent.