To enhance lubrication of a rolling element in a roller bearing type rocker arm, and to secure a long life of the rolling element.

The rocker arm 1 is rocked by a cam 21 and drives a valve 22 of a cylinder head of an internal combustion engine. A freely rockable arm element 2 is provided with a valve acting section 3 acting on the valve 22 and a roller 5 rolling and abutting on the cam 21. The roller 5 is freely rotatably supported via the rolling element 9 in a periphery of a roller shaft 8 attached to the arm element 2. A roller bearing 7 is constructed of the roller shaft 8, the rolling element 9 and the roller 5. The roller shaft 8 consists of a hollow shaft with one end closed, and through-hole 10 inserted through an inner diameter hole 8a of the roller shaft 8 from an upper surface of a roller shaft attaching section 4 of the arm element 2, is provided, In an anti-load region of the roller shaft 8, an oil feed hole 11 inserted through a rolling surface of the rolling element 9 from an inner diameter surface is provided.