Disclosed is a nucleic acid delivery carrier which can deliver a nucleic acid (e.g., siRNA) into a cell with high efficiency when the nucleic acid is administered to an animal-derived cell or an animal body, and which is less toxic and highly safe. Also disclosed is a nucleic acid delivery composition comprising the carrier and a nucleic acid. The nucleic acid delivery carrier comprises a combination of (A) diacylphosphatidyl choline, (B) at least one member selected from the group consisting of cholesterol and a derivative thereof, and (C) an aliphatic primary amine. A nucleic acid delivery composition can be prepared by mixing the nucleic acid delivery carrier with a nucleic acid.
