Provided are a device and a method for styling hair capable of reducing damage to hair, maintaining the elasticity and texture of the hair, and keeping the hair style for a long period of time. The hair styling device is equipped with an arm body 2 having an arm 2A and an arm 2B connected to each other, an oscillation means 3, and an oscillator 9. The arm body 2 is constituted such that it can retain or release the hair. The oscillation generated from the oscillation means 3 has a predetermined frequency from 1 to 20000 Hz. The oscillator 9 is constituted such that it can slide along the length direction of the arms 2A and 2B and at the same time can transmit the oscillation from the oscillation means to the hair retained by the arm 2 while sliding.