A heat-resistant air hose for a diesel engine comprising a tubular inner layer and an outer layer formed on an outer peripheral surface of the inner layer, wherein a material for forming the inner layer contains at least one of the following components (A) and (B) and excludes an acid receiver, and a material for forming the outer layer contains a non-peroxide-crosslinkable ethylene acrylic rubber and a non-halogen flame retardant wherein the non-halogen flame retardant is present at not less than 60 and less than 80 parts by weight based on 100 parts by weight of the non-peroxide-crosslinkable ethylene acrylic rubber: (A) an alloy material formed by mixing ethylene acrylic rubber and fluororubber wherein the ethylene acrylic rubber is present at not less than 20% by weight based on the total alloy material; and (B) at least one of acrylic rubber and ethylene acrylic rubber.