IGNITION TIMING CONTROL DEVICE AND IGNITION SYSTEM

The present invention provides an ignition timing control device and an ignition system which are capable of performing ignition timing control that easily suppresses occurrence of knocking for internal combustion engine. An ignition timing control device has a knocking detection device 41 detecting knocking of internal combustion engine; and an ignition timing adjustment device43adjustingignitiontimingofinternalcombustion engine according to a knocking signal obtained from knocking detection device 41 and indicating knocking state and an externally-obtained signal concerning the ignition timing of the internal combustion engine. Knocking detection device 41 and ignition timing adjustment device 43 are electrically connected and formed integrally with each other. Ignition timing adjustment device 43 is provided with a first connecting portion 101 inputting the signal concerning the ignition timing and a second connecting portion 103 outputting the signal concerning the ignition timing that undergoes adjustment to a switching element 376.