A vibration-damping device, comprising: a vibration-damping device body; and a bracket, wherein the vibration-damping device body comprises: a first mounting member mounted on one of a vibration-generating portion and a vibration-receiving portion via the bracket; a second mounting member mounted on the other of the vibration-generating portion and the vibration-receiving portion; and an elastic body connecting the first mounting member and the second mounting member, the first mounting member is fitted into a fitting hole formed in the bracket, a first guide portion, which has one of a projected shape and a recessed shape extending in a first axial direction along a central axis of the fitting hole, is formed on an outer circumferential surface of the first mounting member, a second guide portion, which has the other of the projected shape and the recessed shape extending in the first axial direction, is formed on an inner circumferential surface of the fitting hole, the first guide portion is fitted to the second guide portion, the first mounting member is formed of a synthetic resin material, a metal fitting having first engagement surfaces coming into contact with the second guide portion is arranged on the first guide portion, and a surface of at least a part of the second guide portion is formed of a metal material, and is a second engagement surface that comes into contact with the first engagement surface, characterized in that the metal material of which the metal fitting is formed has a smaller longitudinal elastic modulus than that of a metal material of which the second engagement surface is formed. a vibration-damping device body; and a bracket, wherein the vibration-damping device body comprises: a first mounting member mounted on one of a vibration-generating portion and a vibration-receiving portion via the bracket; a second mounting member mounted on the other of the vibration-generating portion and the vibration-receiving portion; and an elastic body connecting the first mounting member and the second mounting member, a first mounting member mounted on one of a vibration-generating portion and a vibration-receiving portion via the bracket; a second mounting member mounted on the other of the vibration-generating portion and the vibration-receiving portion; and an elastic body connecting the first mounting member and the second mounting member, the first mounting member is fitted into a fitting hole formed in the bracket, a first guide portion, which has one of a projected shape and a recessed shape extending in a first axial direction along a central axis of the fitting hole, is formed on an outer circumferential surface of the first mounting member, a second guide portion, which has the other of the projected shape and the recessed shape extending in the first axial direction, is formed on an inner circumferential surface of the fitting hole, the first guide portion is fitted to the second guide portion, the first mounting member is formed of a synthetic resin material, a metal fitting having first engagement surfaces coming into contact with the second guide portion is arranged on the first guide portion, and a surface of at least a part of the second guide portion is formed of a metal material, and is a second engagement surface that comes into contact with the first engagement surface, characterized in that the metal material of which the metal fitting is formed has a smaller longitudinal elastic modulus than that of a metal material of which the second engagement surface is formed.