To make strokes of putting easy.

This golf putter applies psychological tendency of human visual nerve to follow gleamy object and a spectrum function. The putter is installed with two visible LED lamps 2 that are lighted on to produce two light lines virtually made by the spectrum function. A correct back swing is confirmed that the same is being made when these two light lines draw straight parallel lines from the right aft of a ball to the opposite side on the trajectory of the running ball, and the simple repeated practices can reduce miss-swings. Batteries, a voltage regulator and such are installed to the inside of the putter's grip.