To provide a bush fitting structure capable of facilitating the work for fitting a bush to a link and a lever without using a special device.

The bush 20 has a cylinder part 21 provided with a through hole 22, a first flange part 23 formed into a flange shape in one end of the cylinder part 21, and a second flange part 25 formed into a long flange shape in the other end of the cylinder part 21 and having an end surface 25a to be tightly brought in contact wit a fitting surface 31a on a lever 30 side in the condition wherein it is fitted to the lever 30. The lever 30 is stood in the vertical direction from the fitting surface 31a, with which the end surface 25a of the second flange part 25 is tightly brought in contact and which has a projection part 33 having a wide part 33a in a tip thereof. Cross section of the through hole 22 is formed into a shape, into which the projection part 33 can be inserted and which can rotate by the predetermined angle in the predetermined direction in the condition wherein the wide part 33a of the tip of the projection part 33 is projected from the through hole 22. A surface wherein the bush 20 and the lever 30 are tightly brought in contact with each other has a pair of locking structure for preventing reverse rotation after rotating by the predetermined angle.