A vehicle seat may have an angle detection device configured to detect a reclining angle of a seatback, an angle detection reference member configured to serve as a reference for the angle detection device, and a rotation limiting guide unit configured to connect a seat fixing structure to the angle detection reference member and to limit rotation of the angle detection reference member by guiding upward-and-downward and forward-and-rearward movements of the angle detection reference member during tilting of a seat cushion around a hinge structure.