Variety of Wearable Walking Assistant Robots (W2ARs) are appearing on the market. Their safety attracts the interest of manufacturers as well as the users. In this paper, we address risk assessments and clarify the typical risks of W2ARs. We also discuss practical safety measures for the risks. The strength testing machines are proposed and produced to verify the inherent safety measures: the mechanical angle stoppers and appropriate assembling. This paper will aid the industrialization of W2ARs.