A thermoelectric element comprising: a first metal substrate including a first through-hole formed therein; a first insulating layer disposed on the first metal substrate and including a second through-hole formed at a position corresponding to the first through-hole; a first electrode part disposed on the first insulating layer and including a plurality of first electrodes; a thermoelectric leg (240, 250) disposed on the first electrode part; a second electrode part disposed on the thermoelectric leg (240, 250) and including a plurality of second electrodes; a second insulating layer disposed on the second electrode part; and a second metal substrate disposed on the second insulating layer, wherein the first metal substrate includes a first outer periphery, a second outer periphery, a third outer periphery, and a fourth outer periphery which define a shape of the first metal substrate, wherein the first outer periphery and the fourth outer periphery are opposite to each other, wherein the second outer periphery and the third outer periphery are opposite to each other between the first outer periphery and the fourth outer periphery, wherein the first electrode part includes a first region vertically overlapping the plurality of second electrodes, characterized in that at least one of the plurality of first electrodes includes an extension portion extending toward the first outer periphery from the first region, and in that a shortest distance between the second outer periphery and a surface closest to the second through-hole in a first electrode, which is closest to the second through-hole among the plurality of first electrodes disposed between the second outer periphery and the second through-hole, is within ± 10% of a shortest distance between the second outer periphery and the extension portion. a first metal substrate including a first through-hole formed therein; a first insulating layer disposed on the first metal substrate and including a second through-hole formed at a position corresponding to the first through-hole; a first electrode part disposed on the first insulating layer and including a plurality of first electrodes; a thermoelectric leg (240, 250) disposed on the first electrode part; a second electrode part disposed on the thermoelectric leg (240, 250) and including a plurality of second electrodes; a second insulating layer disposed on the second electrode part; and a second metal substrate disposed on the second insulating layer, wherein the first metal substrate includes a first outer periphery, a second outer periphery, a third outer periphery, and a fourth outer periphery which define a shape of the first metal substrate, wherein the first outer periphery and the fourth outer periphery are opposite to each other, wherein the second outer periphery and the third outer periphery are opposite to each other between the first outer periphery and the fourth outer periphery, wherein the first electrode part includes a first region vertically overlapping the plurality of second electrodes, characterized in that at least one of the plurality of first electrodes includes an extension portion extending toward the first outer periphery from the first region, and in that a shortest distance between the second outer periphery and a surface closest to the second through-hole in a first electrode, which is closest to the second through-hole among the plurality of first electrodes disposed between the second outer periphery and the second through-hole, is within ± 10% of a shortest distance between the second outer periphery and the extension portion.