PROBLEM TO BE SOLVED: To provide a lipid double membrane device 1 having high stability.SOLUTION: The lipid double membrane device 1 comprises: a projection part 10 which has a convex shape having a curved apical surface and is made of a conductive water-containing material; a solution storage tank 40 in which a conductive aqueous solution 30 is stored which has a solution surface covered by an oily solution layer 20 containing lipid 21 dissolved therein; and a lipid double membrane 22 which is formed between the apical surface of the projection part 10 and a solution surface 30SA of the aqueous solution 30, and is made of the lipid 21.
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