Abstract: In a gear arrangement consisting of two gears meshed with each other, at least one gear is constructed of a teeth portion having teeth along its circumference and a shaft portion adapted to be mounted to a support shaft, a gap space is retained between the teeth portion and the shaft portion, and an elastic body such as an O-ring, an annular spring, etc. is interposed in the gap space. And a tooth thickness of one gear of the above-mentioned two gears is made larger than that of the other gear. When the above-described two gears are meshed with each other, the teeth portion of the gear having the elastic body interposed therein moves in the radial direction with respect to the shaft portion, and thereby the teeth of the respective gears can be meshed without backlash.