INTERNAL COMBUSTION ENGINE

An object of the present invention is to provide an internal combustion engine which can regenerate purification means without causing problems such as noise production, abnormal temperature rise, or smoke production. A control means (30) is configured to, when the air-fuel ratio of the exhaust gas is enriched to reduce and purify the hazardous substance occluded by the purification means (23, 25), perform first combustion in which the air-fuel ratio is enriched by performing post-injection if a load of the internal combustion engine (1) is less than a set value, and perform second combustion in which the air-fuel ratio is enriched without performing post-injection if the load is greater than or equal to the set value.