Locking apparatus for folding headrest for vehicles

An apparatus for locking a folding headrest for a vehicle, comprising:

• a headrest housing pivotally coupled to a stay of a seat back frame;
• a support bracket fastened to the headrest housing and having a locking slot, into which a striker of the stay is removably inserted, wherein the striker is disposed a predetermined distance from the stay;
• a latch, a first end portion of which is pivotally coupled to the support bracket, wherein the latch locks the striker by using rotation of the latch when the striker is inserted into the locking slot of the support bracket;
• a rotating member, a first end portion of which is pivotally coupled to the support bracket and a second end portion of which is coupled to the latch by an elastic member, so that the rotating member and the latch are biased in opposite rotational direction each other;
• and
• a link unit pivotally coupled to the headrest housing, one end of which is coupled to the rotating member, such that the latch is released from the rotating member by applying an external force of the link unit applied to the rotating member.