Provided is a control apparatus for an internal combustion engine, capable of improving a response characteristic of a PID feedback control, including: an oil pressure regulating valve having a solenoid; a variable cam phase mechanism for changing a cam phase; and an ECU for controlling the oil pressure regulating valve. The ECU includes: an actual cam phase detecting unit for detecting the cam phase; a target cam phase setting unit for setting a target cam phase; an output duty calculating unit for calculating an output duty; a feedback control unit for controlling the cam phase via the output duty calculating unit with PID feedback control; a coil temperature detecting unit for detecting a temperature of a coil; a circuit resistance calculating unit for calculating a resistance of an electric circuit by correcting a resistance of the coil based upon the temperature of the coil; and an integral term initial value calculating unit for calculating a holding output duty based upon the resistance of the electric circuit. When an integral term is initialized, the feedback control unit sets the holding output duty as the integral term.