<p>A styrene elastomer composition comprising a styrene elastomer and a lamellar inorganic compound sufficiently finely dispersed therein. The gas-barrier properties of the styrene elastomer has been improved, and the composition has satisfactory mechanical properties. The styrene elastomer composition comprises (a) a styrene elastomer, (b) a lamellar inorganic compound to which an organic nature has been imparted with organic cations, and (c) a polar polymer having compatibility with the styrene elastomer (a) and having a polar functional group in the molecule, wherein the lamellar inorganic compound (b) to which an organic nature has been imparted has a sheet-to-sheet distance of 15 Å or longer.</p>
