The present invention relates to an adapter for a drug injector. More specifically, the ring body formed in a circular shape; A first extension rod extending upward from the ring body and having a first detachment preventing protrusion formed at an end thereof; And a second extension unit extending upward from the ring body, extending at a position symmetrical to the first extension unit, and having a second separation prevention protrusion formed at an end thereof, wherein the ring body) is made of a material having elasticity. It characterized in that it is configured. According to the present invention, the ring body is coupled to the drug injector and the first release preventing protrusion formed on the first extension and the second release preventing protrusion formed on the second extension are detachably coupled to the cover, so that the drug injector and the cover There is an effect that can be easily combined.
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