Valve timing controller

A valve timing controller which controls a valve timing of an intake valve that opens and closes a cylinder of an internal combustion engine using a pressure of working fluid, the valve timing controller comprising:

• a housing rotor that is rotatable synchronously with a crankshaft of the internal combustion engine;
• a vane rotor that is rotatable synchronously with a camshaft of the internal combustion engine, the vane rotor receiving the pressure of working fluid in the housing rotor such that a rotation phase of the vane rotor with respect to the housing rotor is changed;
• and
• a lock mechanism that locks the rotation phase at a main lock phase when the internal combustion engine is started with an ambient temperature more than or equal to a preset temperature, the main lock phase representing the rotation phase set for closing the intake valve at a later timing later than a timing when a piston reaches a bottom dead center in the cylinder of the internal combustion engine, the lock mechanism locking the rotation phase at a sub lock phase representing the rotation phase advanced rather than the main lock phase in the internal combustion engine when the internal combustion engine is started with an ambient temperature lower than the present temperature.