A retractable pin includes: a cylindrical body, a retractable member with an insertion cavity at one end, and a spring disposed in a spring cavity defined by the combination of the retractable member and the cylindrical body. Upon application of a force to a free end of the retractable member, the retractable member is configured to retract into the cylindrical body by means of compression of the spring. This invention is further directed to a coaxial connector including a retractable pin as described above.