A structure for fixing a shift cable, which is used to install a shift cable of a manual transmission, comprising: a protective tube for receiving the shift cable therein; a damper; a main casing which is installed outside the damper and forms a clearance for assembly with a mounting bracket; a sub-casing which is detachably coupled to the main casing by means of an axial assembly guide portion; and a cover which is supported by means of an elastic means with respect to the sub-casing and is installed such that an axial displacement of the cover is restricted with respect to the main casing, characterized by a connection tube installed outside the protective tube; wherein the damper is installed outside the connection tube to attenuate radial and axial vibration; wherein the protective tube comprises a fixed tube and a moving tube which are installed outside the shift cable while being coaxially arranged with the shift cable, wherein the fixed tube is formed, at an outer peripheral surface thereof, with a catching protrusion for coupling with an inner peripheral surface of the connection tube, and the moving tube is formed, at an outer peripheral surface thereof, with a spherical connection portion capable of rotating relative to the inner peripheral surface of the connection tube, wherein the connection tube comprises: a first tubular member which is formed, at an inner peripheral surface thereof, with a catching groove for coupling with the catching protrusion of the fixed tube; a second tubular member which is formed, at an inner peripheral surface thereof, with a spherical seating portion for coupling with the spherical connection portion of the moving tube; and a division flange which protrudes outward between the first and second tubular members (220, 240). a protective tube for receiving the shift cable therein; a damper; a main casing which is installed outside the damper and forms a clearance for assembly with a mounting bracket; a sub-casing which is detachably coupled to the main casing by means of an axial assembly guide portion; and a cover which is supported by means of an elastic means with respect to the sub-casing and is installed such that an axial displacement of the cover is restricted with respect to the main casing, characterized by a connection tube installed outside the protective tube; wherein the damper is installed outside the connection tube to attenuate radial and axial vibration; wherein the protective tube comprises a fixed tube and a moving tube which are installed outside the shift cable while being coaxially arranged with the shift cable, wherein the fixed tube is formed, at an outer peripheral surface thereof, with a catching protrusion for coupling with an inner peripheral surface of the connection tube, and the moving tube is formed, at an outer peripheral surface thereof, with a spherical connection portion capable of rotating relative to the inner peripheral surface of the connection tube, wherein the connection tube comprises: a first tubular member which is formed, at an inner peripheral surface thereof, with a catching groove for coupling with the catching protrusion of the fixed tube; a second tubular member which is formed, at an inner peripheral surface thereof, with a spherical seating portion for coupling with the spherical connection portion of the moving tube; and a division flange which protrudes outward between the first and second tubular members (220, 240). a first tubular member which is formed, at an inner peripheral surface thereof, with a catching groove for coupling with the catching protrusion of the fixed tube; a second tubular member which is formed, at an inner peripheral surface thereof, with a spherical seating portion for coupling with the spherical connection portion of the moving tube; and a division flange which protrudes outward between the first and second tubular members (220, 240).