A connector is provided with an inlet port into which a liquid is poured and which has a first flow path through which the poured liquid passes, a liquid discharge port to which a tube body can be connected and which has a second flow path which discharges to the connected tube body the liquid having passes through the first flow path, a gas discharge means which discharges air in the first flow path when the liquid is poured in the first flow path, and a blocking means which, when the liquid is poured in the first flow path, temporarily stops the flow of the liquid before the poured liquid reaches the second flow path. The connector is used as follows: an opening section of the liquid discharge port is sealed, a liquid is poured in the inlet port with the tube body not yet connected to the liquid discharge port, causing air in the first flow path to be discharged by the gas discharge means, the flow of the liquid is temporarily stopped in the first flow path by the blocking means, the opening section of the liquid discharge port is unsealed with the flow of the liquid temporarily stopped, the tube body is connected to the liquid discharge port, and the flow of the liquid is resumed.
