A low-friction sliding mechanism of the present invention comprises first and second sliding members slidable relative to each other at sliding surfaces thereof and a lubricant being applied to the sliding surfaces of the first and second sliding members. The first and second members are made of a diamond-like carbon material and an iron-based material, respectively, and the lubricant comprises a base oil and at least one of an ashless fatty-ester friction modifier and an ashless aliphatic-amine friction modifier.