To provide a straight iron capable of equally supplying heat to clamped hair.

The straight iron 1 includes: an upper clamping body 2 provided with an upper iron 6 for heating a heating plate by a heating element; a lower clamping body 8 provided with a lower iron 12 for heating the heating plate by the heating element so as to face the upper iron 6; and a main shaft turnably connecting the upper clamping body and the lower clamping body. The upper clamping body 2 is provided with an adjustment part 15 for vertically moving a rear end part with the front end part of the upper iron 6 as a fulcrum.