Abstract: A rodless cylinder includes a cylinder body with a longitudinal bore closed at both ends, a piston which reciprocates inside the bore of the cylinder body, a longitudinal slot along a surface of the body communicating the bore to the exterior of the body, a slide table which is connected by a coupling member extending through the slot to the piston and which moves in conjunction with the piston against the surface of the cylinder body, and sealing members to cover the slot in the cylinder body. A pair of generally V-shaped bearing members, formed from a synthetic resin, are interposed between the slide table and the cylinder body. The bearing members are received in channels formed in the slide table, and receive wedge-shaped distal ends of sidewalls projecting axially upward from the cylinder body, and inwardly toward each other.