To provide a coaxial plug capable of easily connecting a coaxial cable, and also capable of corresponding to a plurality of coaxial cables having different diameters.

A cylindrical member 11 is perpendicularly combined with a cylindrical member 18. A contact pin 12 is disposed at the center of the cylindrical member 11, a core wire connecting pin 21 is disposed at the center of the cylindrical member 18, and the contact pin 12 is electrically connected with the core wire connecting pin 21. Connecting piece 22a, 22b having elasticity are provided at the tip of the core wire connecting pin 21. A ring member 23 having an inner diameter corresponding to the diameter of the coaxial cable is fitted to the cylindrical member 18. The center conductor 51 of the coaxial cable 50 is inserted between the connecting pieces 22a, 22b to hold the center conductor 51 between the connecting pieces 22a, 22b. The tip part 53 of the coaxial cable 50 is engaged with the ring member 23, and thereby the coaxial cable 50 is fixed to a cable fixing fitting 24 by caulking.