Valve opening and closing timing control device

A valve opening and closing timing control device comprising:

• a driving-side rotating body configured to rotate about a rotating shaft core synchronously with a crankshaft of an internal combustion engine;
• a driven-side rotating body located inside the driving-side rotating body and coaxially with the rotating shaft core, and configured to rotate integrally with a camshaft for opening and closing an intake valve of the internal combustion engine;
• a phase adjusting mechanism configured to set a relative rotation phase between the driving-side rotating body and the driven-side rotating body by a driving force of an electric motor;
• and
• a phase controller configured, upon receipt of a command to stop the internal combustion engine, to perform retard operation control to shift the relative rotation phase to a most retarded phase by displacing the driven-side rotating body in a direction opposite to a rotating direction of the driving-side rotating body, and configured, when rotational speed of the internal combustion engine reaches a lower limit rotational speed predetermined during stopping of the internal combustion engine, to perform advance operation control to advance the relative rotation phase as the most retarded phase by displacing the driven-side rotating body in a direction same as the rotating direction of the driving-side rotating body.