A vibration damping device including an inner, a tubular outer disposed on a radially outer side of the inner, an elastic body connecting the inner and the outer, and a retainer disposed on at least one axial end of the inner and penetrated by an opening in an axial direction. The inner includes an annular projection extending outward in the axial direction from at least one axial end face of the inner and inserted in the opening of the retainer. The annular projection includes a plurality of compressed fixation parts arranged apart from each other in a circumferential direction. The retainer is fixed by compression to the inner by the compressed fixation parts being compressed against an inner circumferential surface of the opening.