A graphite electrode comprising: a pole including a socket in an internal screw shape at an end portion; and a nipple in an external screw shape that can be fastened to the socket, wherein a value obtained by subtracting an effective diameter on a small diameter end side of the nipple from an effective diameter on a small diameter end side of the socket is 0.05 to 0.7 mm, and a value obtained by subtracting a taper angle of the socket from a taper angle of the nipple is -2 minutes to -3 minutes 30 seconds, wherein the effective diameter on a small diameter end side of the nipple is a diameter of a circle located in an intersection portion of a plane orthogonal to a nipple axis in a position of the small diameter end and a cone configuring the pitch line of the nipple screw thread, the effective diameter on a small diameter end side of a socket is a diameter of a circle located in an intersection portion of a plane of the nipple orthogonal to a socket axis in a position of the small diameter end and the cone configuring the pitch line of the socket screw thread, wherein a maximum diameter portion of the nipple 22 is in a boundary position between the pole and a second pole adjacent to the pole, the taper angle refers to a total angle of a cone represented by a pitch line of a screw thread as defined in JIS R 7201, wherein a taper angle α of the nipple corresponds to a value twice a gradient α/2 with respect to the nipple axis and a taper angle β of the socket corresponds to a value twice a gradient β/2 with respect to the socket axis, and the effective diameter and the taper angle are determined according to the methods indicated in the description. a pole including a socket in an internal screw shape at an end portion; and a nipple in an external screw shape that can be fastened to the socket, wherein a value obtained by subtracting an effective diameter on a small diameter end side of the nipple from an effective diameter on a small diameter end side of the socket is 0.05 to 0.7 mm, and a value obtained by subtracting a taper angle of the socket from a taper angle of the nipple is -2 minutes to -3 minutes 30 seconds, wherein the effective diameter on a small diameter end side of the nipple is a diameter of a circle located in an intersection portion of a plane orthogonal to a nipple axis in a position of the small diameter end and a cone configuring the pitch line of the nipple screw thread, the effective diameter on a small diameter end side of a socket is a diameter of a circle located in an intersection portion of a plane of the nipple orthogonal to a socket axis in a position of the small diameter end and the cone configuring the pitch line of the socket screw thread, wherein a maximum diameter portion of the nipple 22 is in a boundary position between the pole and a second pole adjacent to the pole, the taper angle refers to a total angle of a cone represented by a pitch line of a screw thread as defined in JIS R 7201, wherein a taper angle α of the nipple corresponds to a value twice a gradient α/2 with respect to the nipple axis and a taper angle β of the socket corresponds to a value twice a gradient β/2 with respect to the socket axis, and the effective diameter and the taper angle are determined according to the methods indicated in the description.