To provide a hair iron not required to be applied with so strong force and capable of meshing both hair pressing plates when hair is pinched and pressed between both hair pressing plates.

This hair iron is provided with hair pressing plates 3, 3 on the inside faces of the tip sections 2, 2 of two arms 1, 1 connected rotatably, and hair 4 is pinched and pressed between both hair pressing plates 3, 3. At least one of the hair pressing plates 3, 3 of the arms 1, 1 is heated, and the hair iron is provided with a heat insulating material preventing the heat of the hair pressing plates 3, 3 from being transferred to the outside faces 5, 5 of the tip sections 2, 2 of the arms 1, 1 so that the outside faces 5, 5 of the tip sections 2, 2 of both arms 1, 1 can be pressed by a hand of a user with both hair pressing plates 3, 3 held at the closed state. Extension sections may be provided in the longitudinal direction on the tip sections 2, Z of both arms 1, 1.