The present invention relates to a portable airtight container for beverage which discharges air by operation of a pressing unit (70A) of an air discharger (70). According to the present invention, a hole (30) is formed on an upper surface (110) of the airtight container (100) or a lid body (10). The hole (30) comprises: an air discharge device consisting of an air discharge unit (40) on which a cutting unit (60) of an elastic material is formed; a mounting unit (80) connecting the air discharge unit (40); and a blocking unit (50) connected to the mounting unit (80). When an insertion part (70J) of the air discharger (70) comes into contact with the cutting unit (60) formed on the air discharge unit (40), the cutting unit (60) is opened to move the air discharger (70) with a hand to discharge internal air of the airtight container. When the insertion part (70J) of the air discharger (70) separates from the cutting unit (60) inserted into the hole, the insertion part (70J) immediately contracts by an elastic force to prevent air from flowing into the airtight container. The insertion part (70J) is inserted into the hole to discharge the internal air, and the air discharge unit is removed from the hole. Then a user can drink beverage through the hole. Accordingly, the portable airtight container for beverage discharges air with a discharge device which can be detachably mounted.
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