An electronic control unit provided in an internal combustion engine detects a degree of inter-cylinder variation of the amount of fuel that is injected from a port injector, and a degree of inter-cylinder variation of the amount of fuel that is injected from an in-cylinder injector. In a case where the inter-cylinder variation of one of the port injector and the in-cylinder injector is equal to or greater than a predefined value, a process is executed of limiting, so as not to exceed an upper limit value, an injection proportion of the injector for which the inter-cylinder variation is equal to or greater than the predefined value. This upper limit value is set to be smaller as the degree of inter-cylinder variation of the injector, for which the inter-cylinder variation is equal to or greater than a predefined value, increases.