Motion guide device

A motion guide device, comprising:

• a track base that has a rolling element rolling face formed along a longitudinal direction and has a hollow portion formed to be substantially rectangular in section along a longitudinal direction;
• and
• a moving member that has a load rolling element rolling face formed in a position facing the rolling element rolling face,
• the moving member being assembled movably in the longitudinal direction of the track base via a plurality of rolling elements between the rolling element rolling face and the load rolling element rolling face,
• wherein in the track base, a heat-treated region in which heat treatment is applied to a region including the rolling element rolling face and a non-heat-treated region to which heat treatment is not applied are formed in a section orthogonal to the longitudinal direction, and
• the heat-treated region is formed not to be superimposed on at least some of corner portions of the hollow portion, and
• a border line between the heat-treated region and the non-heat-treated region is provided to extend continuously along a radial direction not to be superimposed on a quenched range, in which range rolling life of the rolling element rolling face can be ensured, and the corner portions.