There is provided a coaxial connector that can ensure high airtightness without using a costly hermetic sealing component. An airtight coaxial connector includes: a resin filling space portion formed more to a coaxial cable connection side than to an insulator in an outer shell; a resin inlet that is open more to a target connector connection side than to the insulator in the outer shell and communicates with the resin filling space portion; and an airtightness resin that is filled in the resin filling space portion through the resin inlet and seals between a central conductor and the outer shell and between a dielectric of a coaxial cable and the outer shell.