A vinyl chloride resin composition that has better electrical insulating properties than existing vinyl chloride resin compositions and a wire coating material that includes the vinyl chloride resin composition are provided. A vinyl chloride resin composition contains 0.1 to 3 parts by weight of synthetic aluminum silicate per 100 parts by weight of a vinyl chloride resin, the synthetic aluminum silicate having an apparent specific gravity of 7 ml/g or more. Synthetic aluminum silicate having a specific surface area of 400 m.sup.2/g or more can be preferably used. The wire coating material contains the vinyl chloride resin composition.