DEVICE FOR ADJUSTING ANGLE OF SEATBACK FOR VEHICLES

Disclosed is a device for adjusting an angle of a seatback for vehicles. The device includes a seat cushion unit including a locking part, a seatback unit rotatably connected to the seat cushion unit, and a link unit connecting the seat cushion unit to the seatback unit. The link unit includes an upper link part including an end fixed to the seat cushion unit to function as a rotation center axis and another end inserted into a back slot portion formed in the seatback unit, a lower link part including an end fixed to the seatback unit and another end inserted into a cushion slot portion formed in the seat cushion unit to be engaged with the locking part, and a joint part to which the upper and lower link parts are coupled. The seatback unit is rotated forward or backward by rotation of the upper and lower link parts.