An operating device comprising: an electromagnet located in a case and fixed to the case through a rib; a capacitor located at an end in the case; a control board located opposite to the capacitor with the electromagnet between them; an auxiliary contact located above the capacitor; a movable part to move by a magnetic force generated from the electromagnet; and a power transmission section to operate in conjunction with movement of the movable part, wherein the capacitor and the auxiliary contact are located at heights not exceeding height of the rib for fixing the electromagnet; and wherein a movable electrode is operated through movement of the movable part so that switching to an open state or a closed state with respect to a fixed electrode is performed; and wherein the power transmission section includes a shaft to move through movement of the movable part and the movable electrode is moved according to movement of the shaft; and a display plate indicating whether the movable electrode is in a closed state or an open state with respect to the fixed electrode, and wherein the auxiliary contact is supported by a support plate, characterized in that another power transmission section is connected to the shaft and in that a rod is connected to the other power transmission section and the rod is moved according to movement of the shaft through the other power transmission section; and in that the display plate changes display according to movement of the rod, and in that a lever of the auxiliary contact and a lever part of the display plate are rotatably engaged with the rod; and in that an area between the capacitor and the auxiliary contact is partitioned by the support plate. an electromagnet located in a case and fixed to the case through a rib; a capacitor located at an end in the case; a control board located opposite to the capacitor with the electromagnet between them; an auxiliary contact located above the capacitor; a movable part to move by a magnetic force generated from the electromagnet; and a power transmission section to operate in conjunction with movement of the movable part, wherein the capacitor and the auxiliary contact are located at heights not exceeding height of the rib for fixing the electromagnet; and wherein a movable electrode is operated through movement of the movable part so that switching to an open state or a closed state with respect to a fixed electrode is performed; and wherein the power transmission section includes a shaft to move through movement of the movable part and the movable electrode is moved according to movement of the shaft; and a display plate indicating whether the movable electrode is in a closed state or an open state with respect to the fixed electrode, and wherein the auxiliary contact is supported by a support plate, characterized in that another power transmission section is connected to the shaft and in that a rod is connected to the other power transmission section and the rod is moved according to movement of the shaft through the other power transmission section; and in that the display plate changes display according to movement of the rod, and in that a lever of the auxiliary contact and a lever part of the display plate are rotatably engaged with the rod; and in that an area between the capacitor and the auxiliary contact is partitioned by the support plate.