An overhead camshaft type valve train includes drive rocker arms interlockingly connected to intake valves (exhaust valves) rockingly supported on a rocker shaft fixed to camholders for rotatably supporting a camshaft, free rocker arms adapted to get free relative to the intake valves (exhaust valves), connection switching mechanisms for switching over the connection and release of connection between the drive rocker arms and the free rocker arms, and lost motion mechanisms for biasing the free rocker arms to a cam side. The respective cam holders are fastened to the cylinder head by pairs of fastening portions with bolts, and holding portions for holding the lost motion mechanisms are formed integrally with the fastening portions.