PURPOSE: A functional hat in which artificial hair can be detachable is provided, which enables a user to express the hat like the hair. CONSTITUTION: A functional hat in which artificial hair can be detachable comprises a hat(10) in which an attachment unit(13) is adhered to the inlet rim(12) inner side of the hat cap(11) covering the head; a fragrance band(20) which is adhered to the top of the rim of the hat cap to be formed in a string shape and in which one of vegetable component and aromatic component is dipped; a lining cap(30) which is inserted into the cap and is fixed and in which an attachment unit(32) is adhered to the inlet rim(31) inner side; a lining(40) of the cap shape which is made of the cloth which cools heat of the scalp; and artificial hair(50) in which an attachment unit(51) is formed.
