Problem
Provided is a practical hair extension configured to be very easily attached to head hair (natural hair) and attachment of which on the head hair is less likely to be noticed by other people.
Solution
A hair extension 1 includes a base member 2, a first hair bundle H 1 , a second hair bundle H 2 , a double-sided adhesive tape 3, and a release paper 4. The first hair bundle H 1 is secured to a lower side of an inner surface of an approximately rectangular plate-shaped base member 2 in a state where hair ends are projected downward. The second hair bundle H 2 is secured to an upper side of the inner surface of the base member 2 in a state where hair ends are projected upward, and the second hair bundle H 2 is folded back at an upper end edge of the base member 2 having the hair ends drooped downward.