A variable valve timing apparatus has a rotational torque transmission path that changes the relative phases of a camshaft that moves an engine valve and a rotary crank body that is coupled to the crankshaft. The rotational torque transmission path has uses an electromagnetic brake delay rotation of a drum, which is coupled to the rotary crank body by a biasing member and a moving member. When rotation of the drum is delayed, the moving member changes the angular orientation between the drum and the rotary crank body against the biasing force of the biasing member. The electromagnetic brake is coupled to a cover by two protrusions and two concavities. The protrusions are arranged to prevent contact between the electromagnetic brake and the drum due to tension of the chain.