Seatback restraint device for vehicle

A seatback restraint device for a vehicle, comprising:

• a first latch provided with a first latch recess, wherein a striker of a vehicle body is configured to be inserted into the first latch recess;
• a second latch provided with a second latch recess, wherein the striker is configured to be inserted into the second latch recess;
• a main hinge configured to penetrate the first and second latches so as to enable rotation and a scissoring operation of the first latch and the second latch;
• and
• an operating cable directly connected to and supported by the first latch and the second latch,
• wherein the first and second latches are operated relative to each other by the operating cable,
• wherein the second latch recess of the second latch is formed so that one side of the second latch recess is open toward the striker when a seatback frame is rotated in a direction of the striker, and
• wherein the first latch recess of the first latch is formed so that one side of the first latch recess is open in a direction perpendicular to an opening direction of the second latch.