An anti-vibration structure for an operation lever of a portable brush cutter, the structure comprising: a pole; an operation unit, such as a cutter, provided at a front portion of the pole; an engine provided at a base portion of the pole and connected to the operation unit through a transmission shaft so as to drive the operation unit; and a lever device provided at the base portion of the pole and configured to allow the user to control an operation of the engine by pulling/returning a throttle wire, wherein the lever device includes: a main body through which the pole is inserted in an axial direction, the main body including protrusions protruding from both ends in the axial direction; support members (13a, 13b) provided on the pole to support the both ends of the main body such that the main body is separated from the pole, each support member (13a, 13b) including a recess; and anti-vibration materials accommodated in the recess of the support members (13a, 13b) so as to be sandwiched between the support members (13a, 13b) and the main body in the axial direction, respectively, each anti-vibration material including a groove to which a respective one of the protrusions of the main body is inserted, characterized in that the protrusions and the grooves each has an H-like shape. a pole; an operation unit, such as a cutter, provided at a front portion of the pole; an engine provided at a base portion of the pole and connected to the operation unit through a transmission shaft so as to drive the operation unit; and a lever device provided at the base portion of the pole and configured to allow the user to control an operation of the engine by pulling/returning a throttle wire, wherein the lever device includes: a main body through which the pole is inserted in an axial direction, the main body including protrusions protruding from both ends in the axial direction; support members (13a, 13b) provided on the pole to support the both ends of the main body such that the main body is separated from the pole, each support member (13a, 13b) including a recess; and anti-vibration materials accommodated in the recess of the support members (13a, 13b) so as to be sandwiched between the support members (13a, 13b) and the main body in the axial direction, respectively, each anti-vibration material including a groove to which a respective one of the protrusions of the main body is inserted, characterized in that the protrusions and the grooves each has an H-like shape. a main body through which the pole is inserted in an axial direction, the main body including protrusions protruding from both ends in the axial direction; support members (13a, 13b) provided on the pole to support the both ends of the main body such that the main body is separated from the pole, each support member (13a, 13b) including a recess; and anti-vibration materials accommodated in the recess of the support members (13a, 13b) so as to be sandwiched between the support members (13a, 13b) and the main body in the axial direction, respectively, each anti-vibration material including a groove to which a respective one of the protrusions of the main body is inserted, characterized in that the protrusions and the grooves each has an H-like shape.