Abstract: A putting stroke teaching aid apparatus includes a pair of standards that are separated from one another along a target line, a reel supported on one of the standards and a cord supported on the reel and movable between a retracted position wound on the reel and an extended position unwound from the reel. The reel is spring loaded to exert a retracting force on the cord such that slack in the cord is taken up by the reel when the cord is extended and secured in place in a pair of slots formed in the standards so that the cord can be aligned directly over the target line by adjusting the positions of the standards on the putting surface. At least one of the standards can be formed with a central cutout aligned vertically with the cord when the cord is supported on the standards, and a plurality of slots can be provided on each standard so that the cord can be supported parallel to the putting surface at different heights.