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Ag+ was introduced into *BEA-type zeolite membrane by an ion-exchange method to enhance olefin selectivity. Ag-*BEA membrane exhibited superior olefin separation performance for both ethylene/ethane and propylene/propane mixtures. Particularly, the separation factor for ethylene at 373 K reached 57 with the ethylene permeance of 1.6×10-7  mol m-2  s-1  Pa-1 . Adsorption properties of olefin and paraffin were evaluated to discuss contribution of Ag+ to separation performance enhancement. A strong interaction between olefin and Ag+ in the