A throttle control device includes a throttle lever fixed to a throttle shaft which is arranged to open or close a valve of a carburetor, an elastically deformable tube having a first end connected to a connection point on the throttle lever, the connection point being spaced from a rotating center of the throttle lever, and an intermediary section fixed at a first fixing position spaced from the connection point by a predetermined distance, and a throttle wire slidably accommodated in the tube and having a first end fixed at a second fixing position, the second fixing position being disposed outside the tube and at a distance from the first end of the tube, and a second end arranged to be manipulated by means of a throttle control lever so that the throttle wire moves relative to the tube, wherein the tube has a curved portion between the connection point and the first fixing position, the curvature radius of which changes due to the movement of the throttle wire relative to the tube.