A valve timing control apparatus includes a driving side rotational member
synchronously rotatable with a crankshaft of an internal combustion
engine, a driven side rotational member arranged coaxially with the
driving side rotational member and synchronously rotatable with a
camshaft of the internal combustion engine, a plurality of fluid pressure
chambers each including an advanced angle chamber and a retarded angle
chamber, a plurality of vanes each dividing the fluid pressure chamber
into the advanced angle chamber and the retarded angle chamber, an
intermediate member of which a portion is provided in the fluid pressure
chamber and engageable with the driving side rotational member and the
driven side rotational member, and an engagement member for causing the
intermediate member to engage with either one of the driving side
rotational member and the driven side rotational member in response to an
operating state of the internal combustion engine.