vulcanizing agent in examples 6 to 10 and comparative examples 5 to 8 the fluororubber was vulcanized with a polyol vulcanizing agent the interlaminar strength was low in comparative example 6 in which the nbr layer contained no metal oxide in comparative example 7 in which the nbr layer was made of an ordinary nbr containing no functional group in comparative example 8 in which the nbr layer was not vulcanized with a peroxide vulcanizing agent and in comparative example 9 in which the fluororubber layer was not vulcanized with a polyol vulcanizing agent in examples 11 to 18 and comparative examples 9 to 12 the fluororubber was vulcanized with a polyamine vulcanizing agent the interlaminar strength was low in comparative examples 9 and 11 in which the nbr layer was made of an ordinary nbr containing no functional group in comparative example 10 in which the fluororubber layer was not vulcanized with a polyamine vulcanizing agent and in comparative example 11 in which the nbr layer was not vulcanized with a peroxide vulcanizing agent table 1__________________________________________________________________________polymer a b c d e f__________________________________________________________________________bd parts 43 57 46 43 54 43an parts 47 36 47 47 36 47functional mga age ma deama dmama hpmamonomer parts 10 7 7 10 10 10chemicals used water 220 water.