PURPOSE: To give sufficient mechanical rigidity to a slider by equipping, a thin plate type ball transfer plate in which a loading ball groove is formed, and a thin plate type attaching plate which has a part to attach a mobile body, and molding both plates in one body by resin or die-cast alloy, etc.

CONSTITUTION: A slider 1 consists of a ball transfer plate 6 in which a loading ball groove 61 is formed and an attaching plate 7 which has a part 71 to attach a mobile body. As the attaching plate 7 has high functional rigidity to fix a mobile body, the attaching plate 7 functions as stiffener of the slider 1, when it is molded as mono body with the ball transfer plate 6 by molding material such as resin or die-cast alloy, etc. Consequently, it is possible to give high rigidity to the slider 1, even if quality of the molding material is relatively soft. If the attaching plate 7 and the ball transfer plate 6 are produced in one body by insert molding, it is possible to easily produce many different kinds of bearings in the shape of the part to attach the mobile body by changing only shape of the attaching plate 7.