The present invention relates to an air vent (90) for an injection mold. The air vent (90) for an injection mold according to the present invention comprises: a housing (100) having a reception opening (110) opened at the top; a reciprocation shaft (200) received in the reception opening (110) so that it protrudes out upwardly, and having a head (240) caught at the top end of the housing (100); an exhaust hole (130) perforated in the bottom surface (120) of the housing (100); an insertion hole (210) formed at the bottom end of the reciprocation shaft (200); and a compression spring inserted to the insertion hole (210) and supported on the bottom surface (120). The air vent (90) for an injection mold has the following effects. Since the compression spring (300) is received in the lower shaft (220), it is possible to prevent the compression spring (300) from being contaminated with tar of a molten synthetic resin contained in the exhausted air. Therefore, it is possible to allow elevation/dropping of the reciprocation shaft (200) for a longer time as compared to the related art. In addition, the air vent is easily assembled/disassembled, and thus allows easy management and repairing.;COPYRIGHT KIPO 2017
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