This invention provides a cooker with a signaling device indicating the stage of cooking comprising a vessel and a whistle, said whistle having a whistle body housing a cavity communicating with the mouth of the whistle through a narrow orifice and with the exterior through another opening situated on the wall of the whistle body, characterizes in that a small container is provided in connection with the said vessel, said small container extending to the bottom of the vessel, and means provided for fitting said whistle on to the said small container with the mouth of the whistle opening to the interior of the small container and its external opening communicating with the exterior in the fitted position of the cooker.