In this project, we have proposed a concept of passive robotics and have developed a prototype of a new walking support system referred to as RT Walker. RT Walker consists of a support frame, wheels, servo brakes and a controller, and has passive dynamics with respect to the force/moment applied to it. This system is intrinsically safe, and many functions for supporting the user are realized by controlling the brake torques appropriately based on Robot Technologies (RT) without using serve motors.