A planetary gear train may include first planetary gear set including first to third rotation elements, second planetary gear set including fourth to sixth rotation elements, third planetary gear set including seventh to ninth rotation elements, fourth planetary gear set including tenth to twelfth rotation elements, fifth planetary gear set including thirteenth to fifteenth rotation elements, first shaft fixed to the first and fifth rotation elements and fixed to the input shaft, second shaft fixed to the fourteenth rotation element and the output shaft, third shaft fixed to the third and seventh rotation elements, fourth shaft fixed to the sixth and tenth rotation elements, fifth shaft fixed to the eighth, eleventh, and fifteenth rotation elements, sixth shaft fixed to the ninth rotation element, and shafts formed by combining remaining rotation elements among the first to fifteenth rotation elements not connected to the first shaft to the sixth shaft.