The present invention relates to expandable styrene resin particles used for obtaining molded foams by pre-expansion and molding. To prevent the content stored in a molded foam such as food container from permeating to the container wall and through the container wall to the exterior, and to prevent mold staining, expandable styrene resin particles containing expandable styrene resin particles containing 3 to 5.5 wt % of an highly volatile blowing agent containing 15 to 60 wt % of isopentane and having a styrene monomer content of not more than 1000 ppm, wherein the expandable styrene resin particles are coated with, based on 100 parts by weight of the resin particles, 0.2 to 0.5 parts by weight of zinc stearate containing not more than 0.1 wt % of a fatty acid sodium salt are provided. In addition, to prevent permeation of the content more sufficiently, expandable styrene resin particles containing expandable styrene resin particles containing an highly volatile blowing agent and having a styrene monomer content of not more than 1000 ppm, wherein the expandable styrene resin particles are coated with 0.01 to 0.5 parts by weight of at least one kind of fatty acid amide and fatty acid bisamide, and 0.2 to 0.5 parts by weight of fatty acid metal salt based on 100 parts by weight of the resin particles are provided.