To materialize an ignition timing control device for an engine capable of increasing accuracy of ignition timing correction.

This device includes: a base ignition timing set means setting base ignition timing according to an engine operation condition; an intake air temperature detection means detecting intake air temperature in a surge tank or an intake air passage at an upper stream of the surge tank; an atmospheric temperature calculation means calculating atmospheric temperature in an engine room; an intake air temperature correction value calculation means correcting intake air temperature from the intake air temperature detection means based on atmospheric temperature from the atmospheric temperature calculation means; and an ignition timing correction means correcting base ignition timing set by the base ignition timing set means based on intake air temperature correction value from the intake air temperature correction value calculation means.

COPYRIGHT: (C)2010,JPO&INPIT