To deliver a sizing cut sheet from a slow speed conveyor to an aligned layer state in a corrugated fiberboard sheet manufacturing laminating line.

In a corrugated fiberboard sheet laminating line L, an intermediate conveyor c' slightly faster than a conveyor (c) is provided at an end of a laminating corrugated fiberboard sheet (a) feeding conveyor (c), a sizing cutter (b) of the sheet (a) is interposed between the conveyors (c) and c', and a slow speed conveyor c" is provided at a slightly lower stage level subsequently to the end of the conveyor c'. A superposing sizing corrugated fiberboard sheet (d) to be conveyed to the conveyor c" is held and conveyed by a cushion roll 6 regulated at the same circumferential speed as the conveyor c".