Disclosed is an airtight container comprising a container body with an opening opened upward, and a cover for opening and closing the opening, the container body comprising a bottom, a wall extended upward from an edge of the bottom, and a cover contact portion provided at a top portion of the wall to come into contact with the cover, the cover comprising a cover body with glass centrally positioned, and a cover seal of which an inward side is coupled around the cover body and an outward side is coupled to the wall and the cover contact portion to maintain sealing between the container body and the cover, and the cover seal comprising a sealing body coupled to surround the cover body, a container contact portion provided beneath the sealing body and shaped corresponding to the cover contact portion to come into contact with the cover contact portion, a sealing skirt extended downwards from an inward plate surface of the container contact portion, and a horizontal rib bent outwards from an end portion of the sealing skirt and elastically transformable for sealing between the container body and the cover by coming into contact with the wall while the opening is closed.
Thus, the airtight container is prevented from a pup-up phenomenon that the cover is separated from the container body by internal pressure, has a simple structure, is easy to use, and includes fewer parts.