<p>A flat discharge tube (10) is provided with a protruding section (32) formed on an outer plane of a container main body (12). The container main body (12) is provided with a relatively thick section (N) by the protruding section (32). A breathing port (30) which can receive a chip tube (16) having an outer diameter (d3) of a gap (d1) or more is formed by using the thick section (N). The wide chip tube (16) not limited by the gap (d1) of a discharge space (15) can be attached to an airtight container (11). Though the wide chip tube (16) is not easily broken and improves gas replacement efficiency in the discharge space (15), it does not affect discharge characteristics of the flat discharge tube (10).</p>
