Locking structure for armrest

A locking structure and an armrest having an armrest housing mounted in a rear seat to be pivotable to a folded up position or a pulled down position, the locking structure comprising:

• a locking pin disposed at a fixed position;
• a catch pivotably coupled to a fixing bracket embedded in the armrest housing, and including an engaging portion formed at a first side of the catch to insert the locking pin into the engaging portion, and a projection and a recess formed to be spaced apart from the engaging portion;
• a latch pivotably coupled to the fixing bracket when the latch is spaced apart from the catch, and including a protruding portion formed at a first side of the latch;
• and
• a knob configured to rotate the latch by a wire,
• wherein when the armrest housing rotates to the folded up position, the catch rotates while the locking pin enters the engaging portion, and the latch rotates to cause the protruding portion to support the projection of the catch to lock rotation of the armrest housing, and when the latch is rotated by an operation of the knob, the locking pin is withdrawn from the catch, to permit the rotation of the armrest housing.