Provided is a foldable pedal apparatus for a vehicle that is configured such that pedal pads protrude toward a driver to be exposed (pop-up state) such that the pedal pads can be operated by the driver in a manual driving mode in which the driver manually drives, and the pedal pads are hidden not to be exposed to the driver (hidden state) such that the pedal pads cannot be operated by the driver in an autonomous driving situation.