Seat reclining apparatus

A seat reclining apparatus comprising:

• a support frame tiltable about a support axis relative to a first frame constituting a seat cushion;
• an angle adjustment unit causing a second frame constituting a seat back to tiltably move forward or rearward relative to the support frame by a driving force of an actuator, the second frame being displaced in a direction to approach and separate from the support axis in a case where the second frame tiltably moves forward or rearward relative to the support frame;
• a lock mechanism selectively operated to an unlocked state where the support frame is allowed to integrally tiltably move with the angle adjustment unit about the support axis and a locked state where the support frame is prohibited to integrally tiltably move with the angle adjustment unit;
• and
• a front stopper provided at the first frame to specify a forward tilt limit of the seat back by making contact with a forward tilt contact portion provided at the second frame in a state where the lock mechanism is in the unlocked state, the front stopper including a linearly-shaped contact surface that makes contact with the forward tilt contact portion and that matches or approximates a virtual straight line passing through the support axis.