To enable a walking difficult person to safely and easily overcome a level difference by providing a plurality of jack type wheeled extensible/contractible longitudinally slidable moving legs on an apparatus.

When walking on flatland, a height of two wheeled extensible/ contractible longitudinally slidable moving legs (JTER) is adjusted to realize a state close to a foot posture and a height at walking time of a healthy person to enable safe walking by reducing a burden to feet. When going up the wide stairs, a JTER-A is advanced, and when a sensor detects an obstacle at a prescribed distance, after raising the whole apparatus by extending a foot of the JTER up to becoming higher than a step, the JTER-A is contracted, and the contraction is stopped at time slightly higher than a height of the step. Wheels are rotated and advanced, the wheels are rested when approaching by a prescribed distance to the obstacle, the JTER-A is extended to be landed on an upper step, a JTER-B is contracted, and after the wheels approach by a prescribed distance to the obstacle, the JTER-B is landed, and a JTER-C is contracted to thereby enable going-over of the step being a defect of the wheels.