the present invention relates to foamed thermoplastic resin moldings which can be used , for example , as food product containers which can contain retort food products , etc ., household electrical appliance parts and automotive interior parts , and to a process for producing the same , said foamed thermoplastic resin molding prepared by shaping a foamed thermoplastic resin sheet , the molding comprising a general part and a thick part wherein these parts differ from each other in thickness wherein the mean expansion ratio of the thick part is not less than 1 . 2 times the mean expansion ratio of the general part and wherein the maximum thickness of the thick part is not less than 1 . 5 times the thickness of the general part .