A combination vehicle passenger seat/child stroller apparatus is adapted to be releasably secured to floor-board seat tracks of a vehicle. The apparatus is selectively convertible between a stroller mode for use outside the vehicle and a seat mode for supporting an adult or child passenger inside the vehicle. The apparatus includes an upright body portion and a corresponding first cushion, a bottom body portion and a corresponding second cushion, where the bottom body portion is operatively coupled to the upright body portion. Also included are front wheels and rear wheels, and front arms and rear arms each having proximal and distal ends. The distal ends of the front arms are operatively connected to the front wheels, and the distal ends of the rear arms operatively connected to the rear wheels. The proximal ends of the arms are pivotally connected to either the upright body portion or the bottom body portion. The front and rear arms are configured to pivot and fold inwardly such that in the seat mode, either the front arms or rear arms secure the apparatus to the seat tracks of the vehicle. When in stroller mode, the front and rear arms are configured to pivot and extend outwardly.