A flywheel having to coaxial members, the first member designed to be rotational integral with a drive shaft such as the crankshaft of an internal combustion engine, the second member designed to be connected with a driven shaft such as a gear box. The coaxial members are mounted via a bearing and coupled to each other. The second member forms a reaction plate of a friction clutch having ventilation holes proximate the bearing. The ventilation holes open into the bottom of a groove provided in the second member around the inner edge of the reaction plate radially above the bearing for collecting lubricating agent such as oil escaping from the center of the flywheel.