A ball-screw type linear motion guide is provided to fix a screw nut to a screw guide easily through screw coupling of a fixing pipe body. A ball-screw type linear motion guide comprises a body(100), a moving block(200), a screw(300), a screw guide, a screw nut and a fixing pipe body. The body has a guide formed in the longitudinal direction in the middle portion and guide rails at side surfaces or upper surface. The moving block is reciprocated along the guide rails of the body. The screw is provided in the guide section of the body and turned by a drive unit provided at one side. The screw guide is provided with a steel cover guide groove for allowing a steel cover(500) covering the guide section of the body to be guided between blades. The screw nut is provided between front and rear guide pipes and coupled to the screw and moves the moving block at the time of turning the screw. The fixing pipe body is couple to the guide pipes of the screw guide, and has a guide hole for allowing for passage of the screw.
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