Brake device for vehicle seat

A brake device for a vehicle seat, the brake device comprising:

• a housing including a first surface having a through-hole, and a second surface having an opening portion;
• an unlocking member configured to be inserted into the housing through the opening portion and including a button part configured to be inserted into the through-hole and positioned on a first surface of the unlocking member that is directed toward the housing, the unlocking member having a plurality of unlocking protrusions disposed along an edge of a second surface of the unlocking member;
• a first elastic member disposed inside the plurality of unlocking protrusions and configured to elastically support the unlocking member;
• a brake ring coupled to the second surface of the housing and having release surfaces and wedge surfaces alternately formed along an inner-diameter portion of the brake ring, the brake ring having a plurality of braking members disposed along the inner-diameter portion of the brake ring;
• and
• a gear member having a seating groove formed in one surface of a brake drum configured to be inserted into the brake ring so that the first elastic member is seated in the seating groove,
• wherein when the button part is pressed, the plurality of unlocking protrusions are configured to be inserted between the plurality of braking members and push rollers of the plurality of braking members, which are positioned on the wedge surfaces, to the release surfaces, such that an unlocked state is implemented.