Mechanical component, mechanism module, movement, and timepiece

A mechanical component comprising:

• a first component having a first surface region;
• a second component having a second surface region on which the first surface region can slide;
• and
• an oil retaining film on at least one of the first surface region and the second surface region and more lipophilic than the at least one surface region;
• and
• wherein the oil retaining film contains a chemical compound expressed by the following formula (1):
• (M1 is one of Si, Ti, and Zr, R is a hydrocarbon radical, Y1 and Y2 are hydrocarbon radicals, hydroxyl groups, or functional groups generating hydroxyl groups through hydrolysis or the like, and Z1 is a polar group;
• wherein the polar group is not an amino group;
• and
• wherein the hydrocarbon radicals are each, independently, an alkyl group or an aryl group containing from 6 to 10 carbon atoms.