Valve timiing controller

A valve timing controller comprising:

• a driving-side rolling body configured to rotate synchronously with a crankshaft of an internal combustion engine;
• a driven-side rolling body which is coaxially held in the driving-side rolling body through a sealing member and is configured to rotate in a unified manner with a camshaft for opening/closing a valve of the internal combustion engine, relative to the driving-side rolling body;
• an advance chamber configured to move a relative rotation phase of the driven side rolling body relative to the driving-side rolling body in an advance direction by a volume increase of the advance chamber through an operating oil supply, and a retard chamber configured to move the relative rotation phase in a retard direction by a volume increase of the retard chamber through an operating oil supply, the advance chamber and the retard chamber being formed of the driving-side rolling body and the driven-side rolling body;
• a torsion spring which is disposed in a space formed between a front plate or a rear plate of the driving-side rolling body and the driven-side rolling body and is configured to bias at all times the driving-side rolling body and the driven-side rolling body in the advance direction or the retard direction;
• and
• a first cylindrical portion provided in the front plate or the rear plate and a second cylindrical portion representing an inner diameter-side wall of an annular groove formed in an end face on opposite side to a side of the camshaft from among end faces of the driven-side rolling body, the first and second cylindrical portions being insertable into each other in an axial direction.