To effectively improve the effect of ironing to hair using a hair iron in simple constitution.

An assisting sheet for the hair iron A is a paper-made sheet. In the hair iron A, one hair H holding surface Ab of a pair of clamping bodies Aa, Aa holding hair H between them is covered with the sheet so that the fiber direction z of paper intersects the moving direction of the clamping body Aa. The sheet is thus fitted to one clamping body Aa, whereby the hair H is rotated around the contact side with the assisting sheet having a large friction to arrange the shape of the hair H uniformly.