The global aging phenomenon significantly increases the risk of falls among older adults, highlighting the urgent need for innovation in mobility aids. Traditional walking aids, such as canes, crutches, wheelchairs, rollators, and exoskeleton robots, all have their own limitations. The smart walker is one of the most promising solutions to assist walking. However, most are still in the laboratory research stage and lack the necessary ergonomic design considerations. After a background analysis of the awarded walkers, this study proposes a design solution, design evaluation, and optimization program for the main structure of the smart walker WalkIES based on Inventor software. This study highlights the importance of optimizing key parameters such as frame foldability, frame adjustability, handle direction, and user comfort to minimize fatigue and maximize support. In addition, the design incorporates lightweight materials to enhance portability without compromising durability. It provides insights into how ergonomic improvements can be systematically incorporated into the product design and manufacturing cycle of the smart walker to ensure user experience and productivity. Future research will focus on producing a functional prototype and conducting systematic user testing under real conditions, which is essential for validating ergonomic and structural performance.