A variable valve timing device includes a rotation transmitting member
rotated integrally with a rotation shaft of an engine, a rotor member
disposed in the rotation transmitting member to be rotated relative to the
rotation transmitting member and rotated integrally with an intake and
exhaust valves controlling member, a fluid chamber defined between the
rotor member and the rotation transmitting member, a vane radially
equipped to one of the rotor member and the rotation transmitting member,
and a covering member fixed to the rotation transmitting member for
covering the fluid chamber. An axial edge surface of the biasing member
discontinuously comes in contact with at least one of the rotor member and
the covering member.
