To provide a low permeable hose excellent in flexibility and excellent in low permeability with respect to a cooling medium.

The outer peripheral surface of a tubular inner layer 1 comprising a rubber or resin is appropriately roughened by plasma treatment and a gas low-permeable layer 2 comprising a resin coating film, which uses at least one of polyacrylic acid and polymethacrylic acid, is formed to the roughened outer peripheral surface of the tubular inner layer 1.