[Object] To provide an apparatus that can easily produce liposomes having uniform diameters.[Solution] Liposomes having uniform diameters can be formed by using a liposome-producing apparatus including a microtube having a channel in which a lipid solution containing one or more lipids, water, and a water-miscible organic solvent flows a housing for housing the microtube and a cooling unit for cooling the solution in the microtube in the housing to a liposome-forming temperature.
