An electric heater comprising: a substrate; a first plane heating element formed on one surface of the substrate; and a second plane heating element formed on one surface of the substrate and located outside the first plane heating element, wherein the first plane heating element includes: a first pattern portion generating heat and having a start point thereof and an end point thereof continuously connected to the start point, the first pattern portion being located in a first zone; a pair of first electrodes (121, 122) located outside the first pattern portion; and a pair of first connectors (131, 132) generating heat and connecting the first pattern portion with the first electrodes (121, 122), and wherein the second plane heating element includes a second pattern portion located to surround the first pattern portion, a start point thereof and an end point thereof continuously connected to the start point, and an opening region devoid of hot wires of the second pattern portion and formed at one side thereof, and the second pattern portion being located in a second zone surrounding the first zone, wherein the second plane heating element further includes: a pair of second electrodes (221, 222) located outside the first zone; and a pair of second connectors (231, 232) connecting the second pattern portion with the second electrodes (221, 222), wherein the second connectors (231, 232) are provided outside and in parallel with the first connectors (131, 132), wherein at least a part of the opening region is located between the pair of second connectors (231, 232), wherein at least a part of the first connectors (131, 132) and at least a part of the second connectors (231, 232) are located in the second zone, and wherein the respective first and second plane heating elements (100, 200) are configured to selectively receive current, characterized in that at least a part of the first connectors (131, 132) generating heat is located in the opening region of the second pattern portion, such that the opening region forms an additional heating area. a substrate; a first plane heating element formed on one surface of the substrate; and a second plane heating element formed on one surface of the substrate and located outside the first plane heating element, wherein the first plane heating element includes: a first pattern portion generating heat and having a start point thereof and an end point thereof continuously connected to the start point, the first pattern portion being located in a first zone; a pair of first electrodes (121, 122) located outside the first pattern portion; and a pair of first connectors (131, 132) generating heat and connecting the first pattern portion with the first electrodes (121, 122), and a first pattern portion generating heat and having a start point thereof and an end point thereof continuously connected to the start point, the first pattern portion being located in a first zone; a pair of first electrodes (121, 122) located outside the first pattern portion; and a pair of first connectors (131, 132) generating heat and connecting the first pattern portion with the first electrodes (121, 122), and wherein the second plane heating element includes a second pattern portion located to surround the first pattern portion, a start point thereof and an end point thereof continuously connected to the start point, and an opening region devoid of hot wires of the second pattern portion and formed at one side thereof, and the second pattern portion being located in a second zone surrounding the first zone, wherein the second plane heating element further includes: a pair of second electrodes (221, 222) located outside the first zone; and a pair of second connectors (231, 232) connecting the second pattern portion with the second electrodes (221, 222), a pair of second electrodes (221, 222) located outside the first zone; and a pair of second connectors (231, 232) connecting the second pattern portion with the second electrodes (221, 222), wherein the second connectors (231, 232) are provided outside and in parallel with the first connectors (131, 132), wherein at least a part of the opening region is located between the pair of second connectors (231, 232), wherein at least a part of the first connectors (131, 132) and at least a part of the second connectors (231, 232) are located in the second zone, and wherein the respective first and second plane heating elements (100, 200) are configured to selectively receive current, characterized in that at least a part of the first connectors (131, 132) generating heat is located in the opening region of the second pattern portion, such that the opening region forms an additional heating area.