| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection mold for a hollow product capable of efficiently manufacturing a thick-walled molded product. SOLUTION: The injection mold is equipped with a hot runner 15 communicating with a cavity 13 and a pin 16 for opening and closing a gate provided in the hot runner 15 in a freely slidable manner, and a core pin 18, which has a notch part 18K provided thereto on the leading end side thereof and has a hollow part 18S formed thereto in order to feed nitrogen gas into the cavity 13 under pressure, is provided in the pin 16 and the nitrogen gas is fed into the cavity 13 under pressure from the pin leading end gap 19S formed between the notch part 18K and the inner wall of the pin 16.
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