A variable valve timing control device includes a housing member, a rotor member assembled on the housing member so as to rotate relative thereto, a vane provided on the rotor member, a fluid pressure chamber divided into an advanced angle chamber and a retarded angle chamber by the vane, a lock mechanism for restricting or allowing a relative rotation between the housing member and the rotor member by a lock member, a fluid pressure circuit for controlling an operation fluid to be supplied to or discharged from the advanced angle chamber, the retarded angle chamber, and the lock mechanism, a plate provided on the housing member and integrally rotating with the housing member, an engaging groove formed on the plate, and a contacting member arranged in the engaging groove so as to rotate integrally with the plate and engaging with a coupling member so as to be assembled thereon.