A tank rubber cushion for providing a vibration-damping support of a fuel tank at multiple locations against a vehicle body, being characterized in that: an inner axial member adapted to be fixed to one of the fuel tank and the vehicle body has flanges at both ends in an axial direction, respectively, and the inner axial member is adapted to be inserted through a mounting hole formed in a support portion provided to another of the fuel tank and the vehicle body, with the flanges of the inner axial member being placed at and facing to both sides of the support portion in the axial direction; two divided rubber cylinders (14a, 14b) are inserted onto an outer peripheral face of the inner axial member while facing each other in the axial direction; an axial vibration-damping rubber portion in an annular form is provided on an axially outside portion of each of the divided rubber cylinders (14a, 14b) and is arranged between opposing surfaces of the flange of the inner axial member and the support portion in the axial direction; a transaxial vibration-damping rubber portion in a cylinder form is provided to an axially inside portion of each of the divided rubber cylinders (14a, 14b) and is thrust into the mounting hole of the support portion from both sides in the axial direction so as to be arranged between opposing surfaces of the inner axial member and the support portion in a transaxial direction; and the transaxial vibration-damping rubber portion of each divided rubber cylinder (14a, 14b) includes a concave/convex portion wherein a diameter vanes in a circumferential direction so that an assembly can be made with a gap between an outer periphery of the inner axial member and an inner periphery of the support portion along the concave/convex portion. an inner axial member adapted to be fixed to one of the fuel tank and the vehicle body has flanges at both ends in an axial direction, respectively, and the inner axial member is adapted to be inserted through a mounting hole formed in a support portion provided to another of the fuel tank and the vehicle body, with the flanges of the inner axial member being placed at and facing to both sides of the support portion in the axial direction; two divided rubber cylinders (14a, 14b) are inserted onto an outer peripheral face of the inner axial member while facing each other in the axial direction; an axial vibration-damping rubber portion in an annular form is provided on an axially outside portion of each of the divided rubber cylinders (14a, 14b) and is arranged between opposing surfaces of the flange of the inner axial member and the support portion in the axial direction; a transaxial vibration-damping rubber portion in a cylinder form is provided to an axially inside portion of each of the divided rubber cylinders (14a, 14b) and is thrust into the mounting hole of the support portion from both sides in the axial direction so as to be arranged between opposing surfaces of the inner axial member and the support portion in a transaxial direction; and the transaxial vibration-damping rubber portion of each divided rubber cylinder (14a, 14b) includes a concave/convex portion wherein a diameter vanes in a circumferential direction so that an assembly can be made with a gap between an outer periphery of the inner axial member and an inner periphery of the support portion along the concave/convex portion.