A linear guide apparatus has a guide rail having a rolling-element rolling groove formed on a side thereof along in an axial direction; and a slider having a rolling-element rolling groove disposed so as to be opposed to the rolling-element rolling groove of the guide rail, the slider moving relatively in the axial direction of the guide rail with rolling elements rollably interposed between the two rolling-element rolling grooves, and a crowning portion disposed on the both axial ends of the rolling-element rolling groove of the slider, wherein a maximum value of sum of load in an axial direction applied on the crowing portion on the both axial ends of the slider by the rolling elements is set to be smaller than a maximum value of load in the axial direction applied on one of the crowning portions of the slider by one rolling element.