An anti-vibration device, comprising an attachment member that can be attached to one side of a vibration generating side and a vibration transmitting side, an elastic member, a bracket that is made of a synthetic resin and is connected to the attachment member via the elastic member, and at least two metal fittings for fastening that have a through hole for fastening the bracket to the other side of the vibration generating side and the vibration transmitting side, wherein the bracket and the metal fittings for fastening are integrally formed; a vibration input position is a position that does not coincide with a virtual line passing through central axes of the through holes of two of the metal fittings for fastening in a planar view of the anti-vibration device; the metal fitting for fastening has a flange portion on an edge side close to the vibration input position in a direction along the central axis of the through hole; and in the planar view, the flange portion has a first outermost peripheral edge and a second outermost peripheral edge, where the first outermost peripheral edge is positioned on a side of the vibration input position in a direction orthogonal to the virtual line, and the second outermost peripheral edge is positioned on the opposite side of the first outermost peripheral edge across the through hole and at a position that is farthest from the vibration input position in the direction orthogonal to the virtual line, and a length in the direction orthogonal to the virtual line from the central axis of the through hole of the metal fitting for fastening to the first outermost peripheral edge is longer than a length in the direction orthogonal to the virtual line from the central axis of the through hole of the metal fitting for fastening to the second outermost peripheral edge. an attachment member that can be attached to one side of a vibration generating side and a vibration transmitting side, an elastic member, a bracket that is made of a synthetic resin and is connected to the attachment member via the elastic member, and at least two metal fittings for fastening that have a through hole for fastening the bracket to the other side of the vibration generating side and the vibration transmitting side, wherein the bracket and the metal fittings for fastening are integrally formed; a vibration input position is a position that does not coincide with a virtual line passing through central axes of the through holes of two of the metal fittings for fastening in a planar view of the anti-vibration device; the metal fitting for fastening has a flange portion on an edge side close to the vibration input position in a direction along the central axis of the through hole; and in the planar view, the flange portion has a first outermost peripheral edge and a second outermost peripheral edge, where the first outermost peripheral edge is positioned on a side of the vibration input position in a direction orthogonal to the virtual line, and the second outermost peripheral edge is positioned on the opposite side of the first outermost peripheral edge across the through hole and at a position that is farthest from the vibration input position in the direction orthogonal to the virtual line, and a length in the direction orthogonal to the virtual line from the central axis of the through hole of the metal fitting for fastening to the first outermost peripheral edge is longer than a length in the direction orthogonal to the virtual line from the central axis of the through hole of the metal fitting for fastening to the second outermost peripheral edge.