The present invention is to provide a curable coating composition having much less of a volatile organic component, and being excellent in coating film performance such as durability and scratch resistance, and a coating film forming method using the above curable coating composition capable of suppressing generation of sagging and so on. The present invention is a curable coating composition which comprises (a) a component having an active methylene group and/or an active methine group, (b) a component having a methacrylate group and/or an acrylate group, (c) a Michael reaction catalyst and (d) a photo-polymerization initiator. The present invention also provides a coating film forming method which comprises a step (1) of applying a curable coating on a substrate to be coated and a step (2) including a stage of irradiating with ultraviolet ray and a stage of heating, said curable coating comprising the above curable coating composition.