A showcase is described. The showcase has at least a vertical side wall with an inner face and an outer face, and at least a horizontal upper wall, with a lower face and an upper face. The side and upper walls are both made of a transparent material and are fixedly fastened to one another at respective edges; the edges of the side and upper walls are shaped so as to comprise respective contact bands facing one another and glued to one another. The contact bands have two horizontal contact bands, one on the edge of the side wall, the other on the edge of the upper wall, and extending between an inner bound and an outer bound, wherein the outer bound is internal with respect to the outer face of the side wall. The upper wall rests horizontally on the side wall and the weight of the upper wall weighs directly on the side wall, without stressing the adhesive with which they are glued, ensuring the safety of the showcase; furthermore, the junction line between the walls is not visible on the side wall, since the outer bound of the contact bands does not reach the outer face of the side wall.