Hair iron

A hair iron having upper and lower casings separated from each other to allow hair to be fitted between the upper and lower casings;

• a heat generating unit provided on either or both of the upper and lower casings;
• and a hinge connection unit connecting first ends of the upper and lower casings with each other via a hinge shaft so that the upper and lower casings rotate at a predetermined angle about the hinge shaft,
• wherein the hinge connection unit comprises:
• a hinge box secured to either of the upper and lower casings;
• first and second movable members provided in the hinge box, and moving between a hinge coupling position where the hinge shaft protrudes out of the hinge box and a hinge releasing position where the hinge shaft is inserted into the hinge box, each of the first and second movable members having the hinge shaft;
• an elastic member elastically provided between the first and second movable members, and exerting an elastic force so that the hinge shaft moves to the hinge releasing position;
• hinge-coupling retaining means manipulated on an outside of the hinge box to move the hinge shaft to the hinge coupling position and simultaneously retain the hinge shaft in the hinge coupling position;
• and
• a hinge-shaft connection lug provided on a remaining one of the upper and lower casings, and having a hinge hole into which the hinge shaft is fitted when the hinge shaft is in the hinge coupling position.