Hot runner apparatus for injection molding

Disclosed is an invention relating to a hot runner apparatus for injection molding. The disclosed invention comprises: a manifold having a resin moving passage formed therein through which a resin moves; a nozzle having a resin injection hole formed therein and installed in the manifold such that the resin injection hole communicates with the resin moving passage, wherein the nozzle injects the resin introduced from the manifold into an injection mold; and an opening/closing part that opens and closes the nozzle, wherein the nozzle comprises: a nozzle main body having a plurality of removably coupled nozzle pieces that are combined in coupling positions, the nozzle main body being installed such that one side thereof communicates with the manifold and an opposite side thereof communicates with the injection mold; a first coupling body coupled to one side of the nozzle main body to restrict one side of each of the nozzle pieces that are combined in the coupling positions; and a second coupling body coupled to the opposite side of the nozzle main body to restrict an opposite side of each of the nozzle pieces that are combined in the coupling positions.