The present invention relates to an ink composition containing fine particles having an amino group on surfaces thereof. According to the invention, there can be provided an ink composition which prevents volatilization or bleedout of an amine compound to cause no discharge of the amine compound into the environment and is also excellent in curability. Further, there can be provided an ink composition which is excellent in curing efficiency, surface curability and internal curability, and can prevent the occurrence of cracks.