A valve control device for an internal combustion engine comprising: a valve disposed on a gas pipe in the internal combustion engine and allowing variation in flow rate of gas flowing in the pipe by opening/closing operations; and a valve actuating unit for performing a fixation avoiding operation for eliminating or preventing any fixation of the valve by opening/closing motions of the valve by a movement quantity for eliminating the fixation in one or the other direction near a valve fully closed position; wherein said valve actuating unit starts an operation for moving the valve in said one direction during said fixation avoiding operation, starts an operation for moving the valve in said other direction when a valve movement quantity reaches said movement quantity for eliminating the fixation before a lapse of a predetermined movement control time, or when the valve movement quantity does not reach said movement quantity for eliminating the fixation even after the lapse of the predetermined movement control time, and starts the operation for moving the valve in said one direction when the valve movement quantity reaches said movement quantity for eliminating the fixation before the lapse of the predetermined movement control time, or when the valve movement quantity does not reach said movement quantity for eliminating the fixation even after the lapse of the predetermined movement control time during the operation for moving the valve in the other direction, and finishes the fixation avoiding operation after the operations for moving the valve in one direction and in the other direction are performed a predetermined number of times; wherein the valve control device further comprises: a fixation determiner for determining as to whether or not said fixation avoiding operation can eliminate the fixation of the valve, wherein said fixation determiner determines that the fixation of the valve is eliminated in the case where the valve movement quantity reaches the movement quantity for eliminating the fixation within a predetermined movement control time after the start of the operation for moving the valve in one direction or the operation for moving the valve in the other direction; and wherein said valve control device prohibits opening/closing operations of the valve during the operation of the internal combustion engine in the case where the fixation determiner determines that the fixation of the valve is not eliminated. a valve disposed on a gas pipe in the internal combustion engine and allowing variation in flow rate of gas flowing in the pipe by opening/closing operations; and a valve actuating unit for performing a fixation avoiding operation for eliminating or preventing any fixation of the valve by opening/closing motions of the valve by a movement quantity for eliminating the fixation in one or the other direction near a valve fully closed position; wherein said valve actuating unit starts an operation for moving the valve in said one direction during said fixation avoiding operation, starts an operation for moving the valve in said other direction when a valve movement quantity reaches said movement quantity for eliminating the fixation before a lapse of a predetermined movement control time, or when the valve movement quantity does not reach said movement quantity for eliminating the fixation even after the lapse of the predetermined movement control time, and starts the operation for moving the valve in said one direction when the valve movement quantity reaches said movement quantity for eliminating the fixation before the lapse of the predetermined movement control time, or when the valve movement quantity does not reach said movement quantity for eliminating the fixation even after the lapse of the predetermined movement control time during the operation for moving the valve in the other direction, and finishes the fixation avoiding operation after the operations for moving the valve in one direction and in the other direction are performed a predetermined number of times; wherein the valve control device further comprises: a fixation determiner for determining as to whether or not said fixation avoiding operation can eliminate the fixation of the valve, wherein said fixation determiner determines that the fixation of the valve is eliminated in the case where the valve movement quantity reaches the movement quantity for eliminating the fixation within a predetermined movement control time after the start of the operation for moving the valve in one direction or the operation for moving the valve in the other direction; and wherein said valve control device prohibits opening/closing operations of the valve during the operation of the internal combustion engine in the case where the fixation determiner determines that the fixation of the valve is not eliminated. a fixation determiner for determining as to whether or not said fixation avoiding operation can eliminate the fixation of the valve, wherein said fixation determiner determines that the fixation of the valve is eliminated in the case where the valve movement quantity reaches the movement quantity for eliminating the fixation within a predetermined movement control time after the start of the operation for moving the valve in one direction or the operation for moving the valve in the other direction; and wherein said valve control device prohibits opening/closing operations of the valve during the operation of the internal combustion engine in the case where the fixation determiner determines that the fixation of the valve is not eliminated.