Variable valve apparatus for internal combustion engine

The invention provides a variable valve apparatus for an internal combustion engine. The variable valve apparatus maintains good loading property and makes opening and closing periods of a valve of the internal combustion engine good. In the variable valve apparatus for the internal combustion engine, one of an intake valve and an exhaustvalve is driven by a rocker cam (21) of an operating angle variable mechanism, and the other one is driven by a rotary cam (11), wherein a camshaft (10) which is used to drive one of the valves of the internal combustion engine is made into a dual structure formed by an outer shaft (13) and an inner shaft (14). The two shafts (13,14) are structured to be able to control relative phase by using a phase control mechanism (40). The phase control mechanism (40) is formed by a cylindric housing (41) which is fixed on the outer shaft (13) and a blade rotor (42) which is fixed on the inner shaft (14).