NOVELTY - The fuel cell hose has an inner layer (1) in contact with fluid, a barrier layer (2) formed on outer peripheral surface of inner layer, and an outer layer (3) formed on outer peripheral surface of barrier layer. Inner layer comprises material (a) containing polyolefin resin and styrene-isobutylene block copolymer. Outer layer comprises material (c) containing polyamide resin. Barrier layer has island-sea structure in which island phases comprising modified polyolefin resin are dispersed in sea phase comprising ethylene-vinyl alcohol copolymer.    USE - As hose for transporting pure water, hydrogen and steam-containing hydrogen for fuel cell system used for power generation system.    ADVANTAGE - The fuel cell hose has excellent flexibility, and barrier properties against hydrogen gas or water, without causing defect such as buckling or cracking at the time of the press fitting of a connector to the hose. The hose is excellent in low extractability by preventing contamination of fluid flowing through the hose, and decrease in electrical charging capacity is suppressed.    DETAILED DESCRIPTION - The fuel cell hose comprises an inner layer (1) in contact with fluid, a barrier layer (2) formed on an outer peripheral surface of the inner layer, and an outer layer (3) formed on an outer peripheral surface of the barrier layer. The inner layer is made of a material (a) containing a polyolefin resin and a styrene-isobutylene block copolymer as essential components. The barrier layer is made of a material (b) containing an ethylene-vinyl alcohol copolymer and a modified polyolefin resin as essential components. The mixing ratio (volume ratio) of the ethylene-vinyl alcohol copolymer to the modified polyolefin resin is 95/5-30/7. The outer layer is made of a material (c) containing a polyamide resin as an essential component. The barrier layer has an island-sea structure in which island phases composed of the modified polyolefin resin are dispersed in a sea phase composed of the ethylene-vinyl alcohol copolymer.    DESCRIPTION OF DRAWING(S) - The figure shows the sectional drawing of the fuel cell hose.    Inner layer (1)    Barrier layer (2)    Outer layer (3)    Adhesive layers (A,B)