A switch attached coaxial connector comprising: an insulation housing defining a terminal accommodation chamber and an insertion hole adapted to receive a plug pin of a coaxial plug; a closed terminal formed of a conductive plate piece and including a fixed contact piece portion and a positioning piece portion supported by the insulation housing in a direction of plug pin insertion inside the terminal accommodation chamber; and a common terminal formed of a conductive plate piece and including a plug contact portion which is disposed below the insertion hole of the insulation housing, a movable contact portion which is movable close to or away from the fixed contact piece portion of the closed terminal, and a leaf spring piece portion which is supported by the insulation housing in a cantilevered manner along the direction of plug pin insertion inside the terminal accommodation chamber and biases the movable contact portion toward the fixed contact piece portion, wherein, in a normal state when the coaxial plug is not connected to the switch attached coaxial connector, the movable contact portion elastically contacts the fixed contact piece portion so that the closed terminal and the common terminal are electrically connected to each other, wherein, when the coaxial plug is connected to the switch attached coaxial connector, the movable contact portion moves so that the contact with respect to the fixed contact piece portion is disconnected and the electrical connection of the common terminal is configured to be switched from the closed terminal to the plug pin, wherein the positioning piece portion of the closed terminal is supported by the insulation housing so that the plate thickness direction of the positioning piece portion's conductive plate piece is parallel to a facing surface facing the common terminal in the movable direction of the movable contact portion, wherein the leaf spring piece portion of the common terminal is provided with a plate portion in which the plate thickness direction of the conductive plate piece is parallel to the facing surface, the movable contact portion of the common terminal extends from the plate portion wherein the movable contact portion's plate thickness direction is parallel to the facing surface. an insulation housing defining a terminal accommodation chamber and an insertion hole adapted to receive a plug pin of a coaxial plug; a closed terminal formed of a conductive plate piece and including a fixed contact piece portion and a positioning piece portion supported by the insulation housing in a direction of plug pin insertion inside the terminal accommodation chamber; and a common terminal formed of a conductive plate piece and including a plug contact portion which is disposed below the insertion hole of the insulation housing, a movable contact portion which is movable close to or away from the fixed contact piece portion of the closed terminal, and a leaf spring piece portion which is supported by the insulation housing in a cantilevered manner along the direction of plug pin insertion inside the terminal accommodation chamber and biases the movable contact portion toward the fixed contact piece portion, wherein, in a normal state when the coaxial plug is not connected to the switch attached coaxial connector, the movable contact portion elastically contacts the fixed contact piece portion so that the closed terminal and the common terminal are electrically connected to each other, wherein, when the coaxial plug is connected to the switch attached coaxial connector, the movable contact portion moves so that the contact with respect to the fixed contact piece portion is disconnected and the electrical connection of the common terminal is configured to be switched from the closed terminal to the plug pin, wherein the positioning piece portion of the closed terminal is supported by the insulation housing so that the plate thickness direction of the positioning piece portion's conductive plate piece is parallel to a facing surface facing the common terminal in the movable direction of the movable contact portion, wherein the leaf spring piece portion of the common terminal is provided with a plate portion in which the plate thickness direction of the conductive plate piece is parallel to the facing surface, the movable contact portion of the common terminal extends from the plate portion wherein the movable contact portion's plate thickness direction is parallel to the facing surface.