A hydraulically driven vehicle is disclosed which is moved or turned by driving left and right hydraulic transmissions with one engine and driving left and right drive wheels with these hydraulic transmissions. The vehicle includes a gear-shifting mechanism for converting the actions of an operator and transmitting the result to the hydraulic transmissions, which mechanism is comprised of a first swinging member that is swung by a vehicle speed cable, and left and right second swinging members that are placed on the first swinging member, that are swung by left and right steering cables, and that push and pull push-pull rods.