A glasses case having a reducible size is described, having an inner frame including a filiform element made of resiliently flexible material. The element has a closed profile and is folded to assume a first, saddle-shaped configuration in which two portions of the element are formed that extend laterally from opposite sides with respect to a top zone of the element, and a case body, which holds the frame in the operative configuration, the body is connected to the frame along its profile and extends to delimit the inner volume of the case. The case has a second, non-operative configuration having a smaller size by a first relative torsional fold of the frame portions, thus forming a substantially eight-shaped configuration, followed by a second fold that brings the frame portions together such that they lie one on top of the other until a flattened shape of the case is obtained.