Abstract: The present invention pertains to a coaxial connector including an insulating base disposing a central terminal passing through a hole thereof to facilitate signal transmission, a first and a second terminals including secure plates to be disposed on a deep slot of the insulating base, a waterproof ring, and a metal shell. Wherein, the secure plates have fixing flanks to strengthen the firmness between the terminals and the insulating base. Wave-shaped contacts with high resilience further protrude from the fixing flanks to prop against or separate from the switch button of the mobile communication device for getting through or disconnecting the communication. Through the highly elastic contacts, the terminals still maintain to firmly contacting with the switch button or rapidly bouncing back even when being subjected to a long-term compression and ensure the stability of the mutual signal transmission among the mobile communication devices.