An electrical coaxial connector comprising; a signal contact member having a connecting terminal portion with which a core conductor of a coaxial cable is to be connected and a contacting terminal portion for coming into contact with a central contact member of a mating coaxial connector fixed to a circuit board, a grounding contact member having an annular engaging portion for engaging with an outer contact member of the mating coaxial connector provided for surrounding the central contact member of the mating coaxial connector to be connected with the same and a shell portion extending from the annular engaging portion to be connected with an outer conductor of the coaxial cable, and a housing made of insulator for supporting the signal contact member and the grounding contact member to be insulated from each other and having a base portion which is provided thereon with an opening into which the contacting terminal portion of the signal contact member is inserted and positioned at the inside of the annular engaging portion of the grounding contact member, characterized in that the housing has further a holding portion extending from the base portion to stand abreast with the same for holding the connecting terminal portion of the signal contact member at the outside of the annular engaging portion of the grounding contact member, so that the contacting terminal portion and the connecting terminal portion of the signal contact member are positioned respectively at the inside and the outside of the annular engaging portion of the grounding contact member in such a manner that, at the inside of the annular engaging portion of the grounding contact member, the connecting terminal portion of the signal contact member and the core conductor of the coaxial cable connected with the connecting terminal portion are not positioned to be piled up on the central contact member of the mating coaxial connector with which the contacting terminal portion of the signal contact member comes into contact. a signal contact member having a connecting terminal portion with which a core conductor of a coaxial cable is to be connected and a contacting terminal portion for coming into contact with a central contact member of a mating coaxial connector fixed to a circuit board, a grounding contact member having an annular engaging portion for engaging with an outer contact member of the mating coaxial connector provided for surrounding the central contact member of the mating coaxial connector to be connected with the same and a shell portion extending from the annular engaging portion to be connected with an outer conductor of the coaxial cable, and a housing made of insulator for supporting the signal contact member and the grounding contact member to be insulated from each other and having a base portion which is provided thereon with an opening into which the contacting terminal portion of the signal contact member is inserted and positioned at the inside of the annular engaging portion of the grounding contact member, characterized in that the housing has further a holding portion extending from the base portion to stand abreast with the same for holding the connecting terminal portion of the signal contact member at the outside of the annular engaging portion of the grounding contact member, so that the contacting terminal portion and the connecting terminal portion of the signal contact member are positioned respectively at the inside and the outside of the annular engaging portion of the grounding contact member in such a manner that, at the inside of the annular engaging portion of the grounding contact member, the connecting terminal portion of the signal contact member and the core conductor of the coaxial cable connected with the connecting terminal portion are not positioned to be piled up on the central contact member of the mating coaxial connector with which the contacting terminal portion of the signal contact member comes into contact.