PURPOSE: To obtain a cap-integrated metering device by which a metering operation is performed in a state that a cap has been put by a method wherein a hollow tube whose lower part is chipped and cut and which is slid on the cylindrical inner wall of a container opening part is fixed and bonded to the inner circumference of the fitting part of the cap and a container of which diameter is smaller than the inside diameter of the hollow tube and of which upper edge protrudes is fixed and bonded to its lower end.

CONSTITUTION: A hollow tube 3 which is slid around the cylindrical inner wall of a container opening part and in which a required part at the lower part has been cut off is fixed and bonded to the inner circumference 2 of the fitting part of a cap 1. In addition, a container 4 whose diameter is smaller than the inside diameter of the hollow tube 3 and whose upper edge protrudes partly is fixed and bonded to the lower end of the hollow tube 3, and the lower end of the upper edge is set to be higher than a liquid level filled into the container. The volume of the container 4 is set to be a little smaller than a volume V which is surrounded by a face which is cut off longitudinally at the lover end cut off most deeply with reference to the longitudinal axis of the hollow tube 3, by the cap 1, by the hollow tube 3 and by the container 4. The lower end of the upper edge of the container 4 is set to be higher than the lower end of the inner wall of the container opening part, and the volume V is set to be a little smaller than a volume which is surrounded by a face cut off transversely at the lower end of the upper edge of the container 4, by the container 4, by the hollow tube 3, by the inner wall of the container opening part and by the cap 1. Thereby, a metering operation can be performed simply by turning the container upside down.