An ECU switches a combustion mode of an HCCI engine from HCCI combustion to spark ignition combustion. The ECU executes the following operations a) and b) before switching an intake lift amount from a first intake lift amount to a second intake lift amount: a): switching an exhaust lift amount from a first exhaust lift amount to a second exhaust lift amount while ensuring an internal EGR amount, and b): delaying a closing timing of an exhaust valve so as to reduce the internal EGR amount after switching the exhaust lift amount from the first exhaust lift amount to the second exhaust lift amount.