Abstract: Upper end edges (7a, 7b, 7c) of positioning reference portions (5a, 5b, 5c) are formed on the outer walls of a funnel (1) for cathode ray tube at distances (downwardly) toward a narrow open end (3) of the funnel from a maximum profile line (4), which is formed in the vicinity of or on a wide open end (2). Thus, molding defects such as deficiency and wrinkle resulting from insufficient filling of glass can be avoided, which are likely to occur in reference surfaces (6a, 6b, 6c) of the positioning reference portions. The present invention eliminates occurrences of small cracks caused by concentration of heat stress, to improve the productivity of the funnel.