A hydrogen tank liner material comprises a polyamide resin composition
which comprises (A) a polyamide resin at 85-40 wt %, (B) a copolyamide at
5-30 wt % and (C) an impact-resistant material at 10-30 wt % with respect
to the total weight of the polyamide resin composition. Preferably, the
(B) copolyamide is PA6/66 and the (C) impact-resistant material is an
acid-modified ethylene/.alpha.-olefin-based copolymer. A hydrogen tank
liner material with excellent gas barrier properties and superior impact
resistance even at low temperatures is obtained.