Provided is a control circuit capable of suppressing flickering of an LED while preventing degradation of the power efficiency. A control circuit is configured to control electric power to an LED illumination based on a rectified drive voltage, the rectified drive voltage being a drive signal rectified by a rectifier, the drive signal being an AC signal whose phase is controlled by a dimmer including a switching device. The control circuit includes a time period detection part configured to detect a time period in which a voltage value of the rectified drive voltage is less than or equal to a predetermined value; and a dimmer current control part configured so that a control current to the dimmer is greater than or equal to a holding current of the switching device during the time period detected.