The concept of da caster is to smoothly harmonize with the design of furniture or fittings, while maintaining a distinct presence as a caster. Rather than a “ball bearing configuration” comprising an axle and bearing, which is the basic structure of a conventional caster, it is characterized by a “sliding configuration” that does not use an axle or bearing. The da caster structure comprises an aluminum shell, a roller, and an internal ring made of special resin, enabling a ring-shaped wheel with a central hole – a hubless caster that possesses sufficient strength and solidity, yet seems to float.