The present invention relates to a foldable cup comprising: a front side having at least one support axial line which is bent in a circumferential direction of the cup and formed to support weight in a vertical direction; a rear side of which both ends are connected so as to face the front side and having at least one support axial line bent in the circumferential direction of the cup and formed to support the weight in the vertical direction; and a bottom side foldable in a six-shaped structure, of which each end portion of the bottom side is connected to the lower ends of the front side and the rear side, wherein the bottom side includes: a folding line divided into two parts so as to be foldable between the front side and the rear side; a main axial line crossing the folding line in a diagonal direction and bent inwards and outwards so as to support the bottom weight; and a plurality of support axial lines connected between two vertices respectively positioned at both end portions of the bottom side and meeting the folding line, and other vertices adjacent to each of the two vertices, and the main axial line is connected to at least one of the support axial lines on the side of each vertex meeting the folding line, in order to disperse weight, thereby facilitating the dispersion of the weight of the contents so as to maintain the original shape of the cup for a longer time.