The present invention relates to a golf putting training apparatus comprising a reaction panel (2); a personal computer that computes detected data; a body having a display portion (3) that displays the output data; two triangular detection areas (A, B) that symmetrically crisscross each other in a plane space between the two side panels (4, 4') of the body (1); light emitting elements (L, R) of detection sensors (S1, S2) installed at the vertex positions of said triangular detection areas (A, B) on side panels (4, 4'); light receiving elements (L1, L2, R1, R2) of detection sensors (S1, S1) provided at the corner positions of the bottom lines of said triangular detection areas (A, B) in such a way as to face said light emitting elements (L, R).