Linear guide apparatus

A linear guide apparatus comprising:

• a guide rail having ball rolling grooves;
• a slider body having ball rolling grooves opposed to said ball rolling grooves of said guide rail which are extended axially in parallel to each other;
• end caps secured respectively to both ends of said slider body, each end cap having a ball retainer locking portion in a joining surface which is in contact with said slider body;
• and
• a plurality of balls inserted in the corresponding ball rolling grooves of said guide rail and said slider body;
• a ball retainer having engaging portions which are engaged with said ball retainer locking portion of said end caps, and both side walls each of which defines, with an edge of each of said ball rolling grooves of said slider body, an opening which is slightly smaller than a diameter of said balls;
• and
• means for preventing movement of the balls from being obstructed by said ball retainer, said preventing means being provided in such a manner that said ball retainer is movably mounted on said slider body with said engaging portions which is movably engaged with said ball retainer locking portions of said end caps.