To provide a motion guide having reduced weight and cost.

On the side face of a moving block 12, a track groove 38 is formed in opposition to a raceway rail 11 to circulate rolling elements 32. The track groove 38 includes a loaded rolling element rolling groove 40 opposed to a rolling element rolling groove 15 of the raceway rail 11 for the rolling elements 32 to roll while being loaded, a noload return groove 42 extending in parallel to the loaded rolling element rolling groove 40 for moving the rolling elements 32 in an unloaded condition, and a pair of deflected grooves 41 connecting the end of the loaded rolling element rolling groove 40 to the end of the noload return groove 42 for turning the moving direction of the rolling elements. The moving block 12 includes a body part 44 having the noload return groove 42 and the pair of deflected grooves 41, and molded using a mold, and a rolling groove structural piece 46 having the loaded rolling element rolling groove 40, and formed of a different material from that for the body part 44 and joined to the body part 44.