To provide a track land vehicle running base which is light, easy to be handled and excellent in its strength.

This track land vehicle running base comprises a first joist 10 and a second joist 20 mounted so as to cross each other on an under surface 1a of a base plate 1, a third joist part 30 mounted on a downward part of the first joist 10 along the second joist 20 with a predetermined gap with the same, and a reinforcement member 40 mounted to have side parts of the second joist 20 and the third joist 30 connected each other. As a gap is formed between the second joist 20 and the third joist 30, the running base can be lightened. And as the second joist 20 and the third joist 30 are connected each other by the reinforcement member 40, it has an enough strength to have a track land vehicle run.