To provide an internal combustion engine control device capable of executing reliable scavenging and preventing erroneous determination.

An internal combustion engine control device comprises: a variable valve apparatus 36 changing opening and closing timings of an intake valve 22 and an exhaust valve 33 of the internal combustion engine 1; a supercharger 29 increasing a pressure of an intake pipe of the internal combustion engine; a scavenging quantity increasing means 48 for increasing an overlap period between the intake valve 22 and the exhaust valve 33 by the variable valve apparatus 36 when the internal combustion engine is in a supercharging region; a scavenging quantity calculating means 49 calculating a scavenging quantity on the basis of at least an intake quantity passing through the intake pipe; and a scavenging quantity reducing means 50 reducing the overlap period by the variable valve apparatus 36 when the scavenging quantity obtained by the scavenging quantity calculating means 49 is equal to or more than a predetermined value.