To provide a sheet feeding apparatus, a sheet feeding method and a press line capable of enhancing the production efficiency by continuously feeding trapezoidal sheets to the press line.

The sheet feeding apparatus 100 comprises: a conveyor 2 for conveying a strip-like sheet body 1; a turning shear 3 for alternately performing the forward inclined cut and the reverse inclined cut to the sheet body 1; an inversion means 5 for inverting a reverse-directional trapezoidal sheet 1b in the same direction as the trapezoidal sheet 1a out of the trapezoidal sheet 1a, and the reverse-directional trapezoidal sheet 1b opposite to the trapezoidal sheet 1a which are alternately formed and arranged on the conveyor 2 by both inclined cuts; and a feed means 6 for feeding the trapezoidal sheet 1a in the same direction to the press line 10.