An intragastric balloon (1) comprises a bag body (2), provided with an internal cavity (6) shaped to contain a filling fluid, and a valve (3) having a valve body (12) provided with a through inner conduit (16) for feeding the filling fluid into the cavity (6)； the valve body (12) is flexible and elastically deformable, being made of an elastic material； and is arranged inside the bag body (2) and shaped so as to elastically deform until it occludes the conduit (16) following a pressure exerted on an outer surface (22) of the valve body (12) by the filling fluid contained in the cavity (6).
