Provided is a vibration damping device having a novel structure and that can have a greatly increased load strength resistance without a concomitant increase in the number of components or size at a stopper mechanism. The structure is such that first and second stopper portions having a hanging plate part and a dip part are provided to a pair of opposing sides of a stopper plate of a vibration damping device, whereas a pair of side plate portions extending between the first and second stopper portions are provided to the other pair of opposing sides of the stopper plate, and openings at both sides of the first and second stopper portions are closed by the pair of side plate portions.