To provide an outer cover molding die for a composite insulator capable of reducing cost of the die and eliminating a reassembling labor with a desirable.

An outer cover molding die 1 for a composite insulator comprises a core member, a sheath part provided at an outer periphery of the core member and an outer casing constructed of a plurality of shades. In the die 1, a pair of die blocks 2 each of which has a shade upper surface forming part 3 at its one main surface 2a and a shade lower surface forming part 4 at the other main surface 2b such that the main surfaces of the adjoining die blocks 2 are connected in a face-to-face relation in a lengthwise direction, and a shape of each of the shade lower surface forming parts 4 is made to have a same shape in all of the die blocks 2 used for a shade formation.