A production method of an exhaust gas purifying catalyst, comprising: a first step of preparing a composite colloidal solution in which noble metal particles contact first compounds which are or become Ce-containing oxides; and a second step of forming second compounds on peripheries of the first compounds in the colloidal solution, the first compounds having been brought into contact with the noble metal particles ; wherein the first step includes: the step of, after preparing colloid of the first compounds by covering the first compounds with a dispersing protection material, bringing a solution containing noble metal into the colloid of the first compounds , thereby preparing composite colloid in which the noble metal particles contact the first compounds , or the step of, after supporting the noble metal particles on surfaces of the first compounds , covering, with a dispersing protection material, the first compounds on which the noble metal particles are supported, thereby preparing composite colloid in which the noble metal particles contact the first compounds , and wherein in the second step, a raw material of the second compound is added to the solution containing the composite colloid covered with the dispersing protection material , whereby a precursor of the second compound is formed on the periphery of the composite colloid, and subsequently, a solid content of the composite colloidal solution in which the precursor of the second compound is formed on the periphery of the composite colloid is separated and fired, whereby the precursor of the second compound is converted into the second compound . a first step of preparing a composite colloidal solution in which noble metal particles contact first compounds which are or become Ce-containing oxides; and a second step of forming second compounds on peripheries of the first compounds in the colloidal solution, the first compounds having been brought into contact with the noble metal particles ; wherein the first step includes: the step of, after preparing colloid of the first compounds by covering the first compounds with a dispersing protection material, bringing a solution containing noble metal into the colloid of the first compounds , thereby preparing composite colloid in which the noble metal particles contact the first compounds , or the step of, after supporting the noble metal particles on surfaces of the first compounds , covering, with a dispersing protection material, the first compounds on which the noble metal particles are supported, thereby preparing composite colloid in which the noble metal particles contact the first compounds , and the step of, after preparing colloid of the first compounds by covering the first compounds with a dispersing protection material, bringing a solution containing noble metal into the colloid of the first compounds , thereby preparing composite colloid in which the noble metal particles contact the first compounds , or the step of, after supporting the noble metal particles on surfaces of the first compounds , covering, with a dispersing protection material, the first compounds on which the noble metal particles are supported, thereby preparing composite colloid in which the noble metal particles contact the first compounds , and wherein in the second step, a raw material of the second compound is added to the solution containing the composite colloid covered with the dispersing protection material , whereby a precursor of the second compound is formed on the periphery of the composite colloid, and subsequently, a solid content of the composite colloidal solution in which the precursor of the second compound is formed on the periphery of the composite colloid is separated and fired, whereby the precursor of the second compound is converted into the second compound . <EOS>