A coaxial electrical connector comprises an outer conductor (10) having a tubular section (11); a central conductor (20) having a contact section (21) extending in the axial direction in the tubular section (11); and a dielectric block (30) molded to hold together both the conductors (10, 20). The central conductor (20) has a radial section (22) extending outwardly in the radial direction from the bottom of the contact section (21) and a connection portion (23A) on the bottom face of the radial section (22) for contact with a circuit board. The central conductor 20 has a surface-processed portion so as to form at least one of a raised portion (24) and an indented portion (22A) and is in contact with the dielectric block at the surface-processed portion.