An engine controller configured to control an engine, the engine including cylinders, an intake passage through which intake air flowing into the cylinders flows, a throttle valve arranged in the intake passage, an intake valve arranged in each of the cylinders, and a valve stopping mechanism (22, 23) capable of stopping an operation for opening and closing the intake valve in each of the cylinders, the engine controller comprising: a combustion cylinder ratio control unit configured to: perform an intermittent combustion operation with a combustion cylinder ratio set to N/(N + M) by repeating cylinder deactivation in a pattern in which combustion is consecutively performed in N cylinders before combustion is consecutively deactivated in M cylinders, wherein N and M are integers greater than or equal to 1; and variably control the combustion cylinder ratio so that a value of at least one of N and M changes; a valve stopping control unit configured to control the valve stopping mechanism (22, 23) so as to stop the operation for opening and closing the intake valve of a cylinder in which combustion is deactivated in the intermittent combustion operation; and a throttle control unit configured to adjust, in a case in which the combustion cylinder ratio is changed by the combustion cylinder ratio control unit, a throttle open degree that is an open degree of the throttle valve so that the open degree decreases when the value of the combustion cylinder ratio is increased by the change and the open degree increases when the value of the combustion cylinder ratio is decreased by the change, characterized in that the throttle control unit is configured to start adjusting the throttle open degree in accordance with the change of the combustion cylinder ratio at an earlier timing when the value of the combustion cylinder ratio is increased by the change than when the value of the combustion cylinder ratio is decreased by the change. cylinders, an intake passage through which intake air flowing into the cylinders flows, a throttle valve arranged in the intake passage, an intake valve arranged in each of the cylinders, and a valve stopping mechanism (22, 23) capable of stopping an operation for opening and closing the intake valve in each of the cylinders, the engine controller comprising: a combustion cylinder ratio control unit configured to: perform an intermittent combustion operation with a combustion cylinder ratio set to N/(N + M) by repeating cylinder deactivation in a pattern in which combustion is consecutively performed in N cylinders before combustion is consecutively deactivated in M cylinders, wherein N and M are integers greater than or equal to 1; and variably control the combustion cylinder ratio so that a value of at least one of N and M changes; a valve stopping control unit configured to control the valve stopping mechanism (22, 23) so as to stop the operation for opening and closing the intake valve of a cylinder in which combustion is deactivated in the intermittent combustion operation; and a throttle control unit configured to adjust, in a case in which the combustion cylinder ratio is changed by the combustion cylinder ratio control unit, a throttle open degree that is an open degree of the throttle valve so that the open degree decreases when the value of the combustion cylinder ratio is increased by the change and the open degree increases when the value of the combustion cylinder ratio is decreased by the change, a combustion cylinder ratio control unit configured to: perform an intermittent combustion operation with a combustion cylinder ratio set to N/(N + M) by repeating cylinder deactivation in a pattern in which combustion is consecutively performed in N cylinders before combustion is consecutively deactivated in M cylinders, wherein N and M are integers greater than or equal to 1; and variably control the combustion cylinder ratio so that a value of at least one of N and M changes; perform an intermittent combustion operation with a combustion cylinder ratio set to N/(N + M) by repeating cylinder deactivation in a pattern in which combustion is consecutively performed in N cylinders before combustion is consecutively deactivated in M cylinders, wherein N and M are integers greater than or equal to 1; and variably control the combustion cylinder ratio so that a value of at least one of N and M changes; a valve stopping control unit configured to control the valve stopping mechanism (22, 23) so as to stop the operation for opening and closing the intake valve of a cylinder in which combustion is deactivated in the intermittent combustion operation; and a throttle control unit configured to adjust, in a case in which the combustion cylinder ratio is changed by the combustion cylinder ratio control unit, a throttle open degree that is an open degree of the throttle valve so that the open degree decreases when the value of the combustion cylinder ratio is increased by the change and the open degree increases when the value of the combustion cylinder ratio is decreased by the change, characterized in that the throttle control unit is configured to start adjusting the throttle open degree in accordance with the change of the combustion cylinder ratio at an earlier timing when the value of the combustion cylinder ratio is increased by the change than when the value of the combustion cylinder ratio is decreased by the change.