Coaxial electrical connector and coaxial electrical connector device

A coaxial electrical connector having an annular contact formed so as to have an annular shape, the coaxial electrical connector configured so that an opposing connector is mated or removed therewith/therefrom along an axial direction of an annular opening, through the annular opening, the annular opening being formed in a ground main-body part of the annular contact, the ground main-body part being provided with a connection leg part configured to be placed on and solder-joined with a printed wiring board, wherein:

• the ground main-body part of the annular contact is formed of an unruptured annular member integrally continued in a circumferential direction at a portion between the annular opening and the connection leg part of the ground main-body part;
• a plurality of through holes are formed between the annular opening and the connection leg part of the ground main-body part of the annular contact at an approximately equal interval in the circumferential direction;
• and
• an annular portion which forms the annular opening extends in a curved shape toward an inner side or an outer side in a radial direction of the annular opening.