A drug container connector (1) is provided with a puncture needle (20) capable of puncturing a plug (186) that seals a mouth (183) of a container (180); and a cover (90) that covers an opening, on a tip side, of a flow channel (21) formed in the puncture needle (20). The puncture needle (20) is configured to penetrate the cover (90) and puncture the plug (186). The puncture needle (20) is provided on a connector main body (10). The cover (90) is held by a slider (50). The slider (90) is movable with respect to the connector main body (10) in a longitudinal direction of the puncture needle (20). The slider (50) is provided with claws (66, 76) capable of engaging with a flange (182) at the mouth of the container (180).