To appropriately supply eluent not having much dissolved air to a column of a chromatography apparatus by a simple means without need for a large-sized deaerator.

By connecting a tube member 40a to a container 6 receiving eluent 7 using this method, the eluent 7 in the container 6 is supplied via the tube member 40a to a column 20 of a chromatography apparatus. A flexible container 6 having airtightness is used as the container 6 for receiving the eluent 7. Further, the eluent 7 is sealed in a vacuum-packed state in the flexible container 6.