A grommet comprising: a fitting body that can be fitted to a periphery of a circular through hole of a wall body (Pw) in an annular fitting groove of an outer wall of the fitting body, and allows a harness body (We) routed in a space part inside of the outer wall along a hole axis of the circular through hole to be drawn out of the space part from each of drawing outlets (14, 14) on both ends in an axial direction, the drawing outlets (14, 14) having a circular shape; an annular sound insulation wall body that has a central axis coaxial with an axis of the fitting body, and is projected in the space part from an inner peripheral wall surface of the outer wall; a first cylinder and a second cylinder (30A, 30B) that have a cylindrical shaft coaxial with the axis of the fitting body, each cylinder (30A, 30B) projects outward from a periphery of the drawing outlets (14, 14) respectively, and allows the harness body (We) in the space part to be drawn outward via inside of the cylinders (30A, 30B); and an inner cylinder that has a cylindrical shaft coaxial with the axis of the fitting body, is interposed at least one of between one of the first cylinder and the harness body (We) and between the second cylinder and the harness body (We), has an outer peripheral surface arranged to face an inner peripheral surface of the first cylinder with a gap, and is drawn from the drawing outlet into the space part to be coaxially connected to an inner peripheral edge of the sound insulation wall body, wherein the said cylinder having the inner cylinder interposed between the said cylinder and the harness body (We) has a first cylindrical part on a free end, a second cylindrical part having a diameter larger than a diameter of the first cylindrical part and being arranged closer to the drawing outlet than the first cylindrical part, and an intermediate tubular part in which an upper base side end is coaxially connected to an end of the first cylindrical part, the end being on a second cylindrical part side, and a lower base side end is coaxially connected to an end of the second cylindrical part, the end being on a first cylindrical part side, wherein the inner cylinder has a variable cylindrical part that is elastically deformed outward in a radial direction by the harness body (We) inside of the first cylinder, causes the outer peripheral surface to adhere to the inner peripheral surface of the first cylindrical part, and eliminates cylindrical-shaped space between the inner cylinder and the first cylindrical part in tubular space corresponding to the gap. a fitting body that can be fitted to a periphery of a circular through hole of a wall body (Pw) in an annular fitting groove of an outer wall of the fitting body, and allows a harness body (We) routed in a space part inside of the outer wall along a hole axis of the circular through hole to be drawn out of the space part from each of drawing outlets (14, 14) on both ends in an axial direction, the drawing outlets (14, 14) having a circular shape; an annular sound insulation wall body that has a central axis coaxial with an axis of the fitting body, and is projected in the space part from an inner peripheral wall surface of the outer wall; a first cylinder and a second cylinder (30A, 30B) that have a cylindrical shaft coaxial with the axis of the fitting body, each cylinder (30A, 30B) projects outward from a periphery of the drawing outlets (14, 14) respectively, and allows the harness body (We) in the space part to be drawn outward via inside of the cylinders (30A, 30B); and an inner cylinder that has a cylindrical shaft coaxial with the axis of the fitting body, is interposed at least one of between one of the first cylinder and the harness body (We) and between the second cylinder and the harness body (We), has an outer peripheral surface arranged to face an inner peripheral surface of the first cylinder with a gap, and is drawn from the drawing outlet into the space part to be coaxially connected to an inner peripheral edge of the sound insulation wall body, wherein the said cylinder having the inner cylinder interposed between the said cylinder and the harness body (We) has a first cylindrical part on a free end, a second cylindrical part having a diameter larger than a diameter of the first cylindrical part and being arranged closer to the drawing outlet than the first cylindrical part, and an intermediate tubular part in which an upper base side end is coaxially connected to an end of the first cylindrical part, the end being on a second cylindrical part side, and a lower base side end is coaxially connected to an end of the second cylindrical part, the end being on a first cylindrical part side, wherein the inner cylinder has a variable cylindrical part that is elastically deformed outward in a radial direction by the harness body (We) inside of the first cylinder, causes the outer peripheral surface to adhere to the inner peripheral surface of the first cylindrical part, and eliminates cylindrical-shaped space between the inner cylinder and the first cylindrical part in tubular space corresponding to the gap.