Abstract: A metal ring preventing the implosion of a cathode-ray tube is fitted on a maximum outer peripheral length part, i.e., the so-called mold match line formation part, of a cathode-ray tube (the so-called Braun tube) of a television receiver in order to provide an implosion-proof cathode-ray tube. The cathode-ray tube implosion-preventing metal ring (10) is formed so that at least two metal strip members (11) are each formed with welding reference projections (13) at the end portions thereof, and these metal strip members (11) are bent so that an annular body formed by connecting these metal strip members (11) has a shape similar to the mold match line formation part of the cathode-ray tube, and they are then welded together while being positioned by the welding reference projections (13). It is also possible to provide a bending reference projection (14) in the central portion of each metal strip member (11), and bend each metal strip member (11) while positioning it by means of the projection (14).