PURPOSE:To give each core interchangeability, and to exchange the cores easily by notching two of a runner up to the contacting surface of a core to a core inserting recessed-section and a runner up to the contacting surface of another core to parting surfaces in respective cores. CONSTITUTION:In a molding die provided with multipler cores in which a plurality of cores 3 are inserted into core inserting recessed-sections 2 for a die proper 1 and molded, two communicating runners of runners 14 up to one contacting surfaces 3a from each core cavity and runners 15 opening to other contacting surfaces 3a at the same distances from corner sections 3b formed by two contacting surfaces 3a are notched at the noses of a runner 13. A plurality of the cores mutually have interchangeability, and any core can be inserted and fixed into the core inserting recessed-sections, thus easily exchanging the cores.
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