A rocking exerciser having a pair of support feet, a rocking rod, a seat pad and a parallel linkage is provided. The rocking rod is provided with a handlebar and a back pad movably disposed thereon. One side of the seat pad is provided with a waist pad. The front portion is provided with a foot rest rod. When the rocking rod is driven forward or backward, a corresponding upward biasing movement to the seat is generated by the pertinent linking rods of the parallel linkage. Accordingly, bowing and stretching movements can be readily performed.