Abstract: A high frequency coaxial connector having a bayonet-tight insertion arrangement for use in a high frequency coaxial circuit, is constructed with an outer installation and an inner installation. The outer installation comprises an external locking sleeve, an internal contact sleeve, a cylindrical insulation body tightly inserted in a contact portion of the internal contact sleeve, an outer insulation sleeve, and a coil spring, one end of which is directly brought into contact with the rear edge of a stopper portion of the internal contact sleeve, and the other end of which is directly brought into contact with the rear edge inner wall of the outer insulation sleeve. The inner installation comprises of a unitarily constructed central contact pin, an insulation plate having a front surface directly brought into contact with a rear edge of the contact pin, and an inside sleeve receiving the insulating plate and the insulating body of the coaxial cable.