To suppress the overheating of a furnace body, to control the local abrasion of electrodes and to avoid the fluctuation of a current path and the instability of the actions of the furnace body.

In this electric furnace for graphitization in which each electrode is projected to the inside of a furnace body, plural sets of electrodes opposingly set between a carbon powder feed opening and a graphite powder recovery port in the furnace body with a graphitization zone between are installed so as to at least partially face to the interior of the furnace main body and an electric current is sent to electrodes 9A and 9B of each set, circular arc faces 13 are formed on the end edges or the peripheral edge at the sides of opposing faces 13 of each opposing electrode.