Method of manufacturing a liquid vessel

A method of manufacturing a liquid vessel including a liquid containing body storing liquid therein, and a liquid residual amount detection device for detecting a residual amount of liquid in the liquid containing body, the liquid residual amount detection device comprises a liquid inflow port adapted to be connected to a discharge port of the liquid containing body, a liquid lead-out portion configured to supply the liquid and a vibration detection portion configured to apply vibration to a flow path between the liquid inflow port and the liquid lead-out portion the method comprising:

• connecting the liquid inflow port of the liquid residual amount detection device to the discharge port of the liquid containing body in which the liquid has been stored in advance;
• and
• injecting the liquid in the liquid containing body into the liquid residual amount detection device to obtain a state in which the flow path is charged with the liquid, thereby extruding gas remaining in the flow path through the liquid lead-out portion.