A melt spinning system comprising: a spinning unit which includes a spinneret for spinning out filaments (f); a cooling unit which includes a cooling cylinder provided below the spinneret, the cooling unit cooling the filaments (f) which are spun out from the spinneret; and at least one exhaust unit which is provided between the spinning unit and the cooling unit in a running direction of the filaments (f), the at least one exhaust unit including a waste channel for sucking and discharging gas which is generated from the filaments (f), the at least one exhaust unit including: a sucking unit which is provided between the spinneret and the cooling cylinder and includes a suction port for sucking the gas; a duct unit which is provided downstream of the sucking unit in a gas discharge direction in which the gas is discharged; an exhaust device which is provided downstream of the duct unit in the gas discharge direction and sucks and discharges the gas; a connecting pipe which is connected to an intermediate part of a fixed pipe which is fixedly provided, the connecting pipe being provided downstream of the exhaust device in the gas discharge direction; and an inflow suppressor which suppresses inflow of the gas into the connecting pipe from the fixed pipe. a spinning unit which includes a spinneret for spinning out filaments (f); a cooling unit which includes a cooling cylinder provided below the spinneret, the cooling unit cooling the filaments (f) which are spun out from the spinneret; and at least one exhaust unit which is provided between the spinning unit and the cooling unit in a running direction of the filaments (f), the at least one exhaust unit including a waste channel for sucking and discharging gas which is generated from the filaments (f), the at least one exhaust unit including: a sucking unit which is provided between the spinneret and the cooling cylinder and includes a suction port for sucking the gas; a duct unit which is provided downstream of the sucking unit in a gas discharge direction in which the gas is discharged; an exhaust device which is provided downstream of the duct unit in the gas discharge direction and sucks and discharges the gas; a connecting pipe which is connected to an intermediate part of a fixed pipe which is fixedly provided, the connecting pipe being provided downstream of the exhaust device in the gas discharge direction; and an inflow suppressor which suppresses inflow of the gas into the connecting pipe from the fixed pipe. a sucking unit which is provided between the spinneret and the cooling cylinder and includes a suction port for sucking the gas; a duct unit which is provided downstream of the sucking unit in a gas discharge direction in which the gas is discharged; an exhaust device which is provided downstream of the duct unit in the gas discharge direction and sucks and discharges the gas; a connecting pipe which is connected to an intermediate part of a fixed pipe which is fixedly provided, the connecting pipe being provided downstream of the exhaust device in the gas discharge direction; and an inflow suppressor which suppresses inflow of the gas into the connecting pipe from the fixed pipe.