Patent ID: 8044761

Claim:
A varistor comprising a varistor element, a pair of external electrodes on one main side of the varistor element and a resistor on the same main side, the resistor being formed in connection with the pair of external electrodes, wherein the varistor element has a main component and accessory components, containing zinc oxide as the main component and calcium oxides, silicon oxides and rare earth metal oxides as the accessory components, the proportion X of the calcium oxides in terms of calcium atoms is 2-80 atomic percent with respect to 100 mol of the main component and the proportion Y of the silicon oxides in terms of silicon atoms is 1-40 atomic percent with respect to 100 mol of the main component, the ratio of X to Y (X/Y) satisfying the following formula (1): 1 ≦X/Y< 3 (1) and the external electrode and the resistor contain oxides other than bismuth oxide and copper oxide.