A vibration-damping device, comprising: a cylindrical outer mounting member which is connected to either one of a vibration-generating portion or a vibration-receiving portion and an inner mounting member which is connected to the other of the vibration-generating portion and the vibration-receiving portion and is disposed inside the outer mounting member; and a pair of first main body rubbers (13a, 13b) which connect the outer mounting member and the inner mounting member and are disposed at an interval in an axial direction along a central axis of the outer mounting member, a partition member which partitions a liquid chamber between the pair of first main body rubbers (13a, 13b) into a first liquid chamber and a second liquid chamber in the axial direction; a second main body rubber which divides the first liquid chamber into a third liquid chamber that uses the first main body rubbers as a part of a partition wall and a fourth liquid chamber that uses the partition member as a part of a partition wall; wherein a first restriction passage which communicates the fourth liquid chamber with the second liquid chamber or the third liquid chamber and a second restriction passage which communicates the second liquid chamber with the third liquid chamber are formed in the outer mounting member, the inner mounting member, or the partition member; respective flow resistances of the first restriction passage and the second restriction passage are different from each other; any one of the second liquid chamber and the third liquid chamber is divided in a circumferential direction around the central axis into liquid chambers (20a, 20b), and each of the liquid chambers (20a, 20b) and the other of the second liquid chamber and the third liquid chamber communicate with each other through the second restriction passage; the second liquid chamber, the third liquid chamber and the fourth liquid chamber are pressure-receiving liquid chambers in each of which a hydraulic pressure fluctuates with the input of vibration; characterized in that the inner mounting member includes an inner cylinder and an outer cylinder into which the inner cylinder is fitted; and the second restriction passage includes an orifice groove formed between the inner cylinder and the outer cylinder, wherein seal portions are disposed between the inner cylinder and the outer cylinder at respective portions positioned on an outer side in the axial direction of the second restriction passage; and each of the seal portions is configured by being disposed in a way that a single piece of annular elastic sealing material is compressively deformed in an annular groove formed on an outer circumferential surface of the inner cylinder and an inner circumferential surface of the outer cylinder. a cylindrical outer mounting member which is connected to either one of a vibration-generating portion or a vibration-receiving portion and an inner mounting member which is connected to the other of the vibration-generating portion and the vibration-receiving portion and is disposed inside the outer mounting member; and a pair of first main body rubbers (13a, 13b) which connect the outer mounting member and the inner mounting member and are disposed at an interval in an axial direction along a central axis of the outer mounting member, a partition member which partitions a liquid chamber between the pair of first main body rubbers (13a, 13b) into a first liquid chamber and a second liquid chamber in the axial direction; a second main body rubber which divides the first liquid chamber into a third liquid chamber that uses the first main body rubbers as a part of a partition wall and a fourth liquid chamber that uses the partition member as a part of a partition wall; wherein a first restriction passage which communicates the fourth liquid chamber with the second liquid chamber or the third liquid chamber and a second restriction passage which communicates the second liquid chamber with the third liquid chamber are formed in the outer mounting member, the inner mounting member, or the partition member; respective flow resistances of the first restriction passage and the second restriction passage are different from each other; any one of the second liquid chamber and the third liquid chamber is divided in a circumferential direction around the central axis into liquid chambers (20a, 20b), and each of the liquid chambers (20a, 20b) and the other of the second liquid chamber and the third liquid chamber communicate with each other through the second restriction passage; the second liquid chamber, the third liquid chamber and the fourth liquid chamber are pressure-receiving liquid chambers in each of which a hydraulic pressure fluctuates with the input of vibration; characterized in that the inner mounting member includes an inner cylinder and an outer cylinder into which the inner cylinder is fitted; and the second restriction passage includes an orifice groove formed between the inner cylinder and the outer cylinder, wherein seal portions are disposed between the inner cylinder and the outer cylinder at respective portions positioned on an outer side in the axial direction of the second restriction passage; and each of the seal portions is configured by being disposed in a way that a single piece of annular elastic sealing material is compressively deformed in an annular groove formed on an outer circumferential surface of the inner cylinder and an inner circumferential surface of the outer cylinder.