There is a growing demand for a walker for an aged person. It is a serious challenge to climb a step by the walker. A mechanism for step-climbing of the walker have been commercialized. However, a considerable amount of force is necessary to climb the step by using it. It is also expensive and has a complex mechanism. Therefore, we work on the development of a new mechanism for step-climbing of the walker. In this paper, we propose a new mechanism that focuses on a front wheel of the walker to climb a step. We verify the effectiveness of it by simulation.
