To provide a hair iron that can make the hair wavy in a single movement and can close an openable heating part by directly holding the part by hand.

A hair iron can be closed by holding a pair of freely openable heating parts. The pair of the heating parts includes: a right-and-left-protruding and center-recessed heating part 10 having a heating surface formed by making the inside ends of a right and left pair of protruding semi-circular heating surfaces 10B, 10B continue to both ends of a center recessed semi-circular heating surface 10A to be waved, and a right-and-left-recessed and center-protruding heating part 20 having a heating surface formed by making the inside ends of a right and left pair of recessed semi-circular heating surfaces 20B, 20B continue to both ends of a center-protruding semi-circular heating surface 20A to be waved. A plate-like finger-tip contact portion 12 made of a heat insulation material is provided on the surface of the right-and-left-protruding and center-recessed heating part 10, while a plate-like finger-tip contact portion 22 made of a well adiabatic material is provided on the surface of the right-and-left-recessed and center-protruding heating part 20.