Wheel base for moving structure

First housing portion is located between the front wheels of the moving structure and the rear wheel in the wheel base for connecting the front side and the rear wheel the wheel, connected to any one of the front wheel and the rear wheel; Said front side wheels and is connected to the other of the rear wheel, is located at the lower side or upper side of said first housing between the first and second housing portion coupled to the first housing portion (the first frame part and the second housing portion is formed with a receiving space); Said housing is located within the space, the first housing portion and a sliding member coupled to either the second housing portion; Wherein the driving part is located at the other kind of cross-section of the first frame part and the second frame section, generating a driving force; And along the connection portion of the slider and the driving unit, and comprising parts of the drive transmission for transmitting the driving force to the sliding member, the drive section is the sliding section of the first frame part and the second frame part and one in the longitudinal direction Transfer, discloses a wheel base, characterized in that for adjusting the distance between said front side wheels and the rear wheels. The wheel base of the moving structure as described above is easy to adjust the distance between the wheels located in the front-rear direction, it is possible to implement the moving superstructure suitable for the situation.