An apparatus for manufacturing an absorbent body comprising: at least two sheet supplying mechanisms, wherein a first sheet supplying mechanism for reeling out and for supplying a sheet from a sheet roll made by reeling up the sheet in a roll shape, the first sheet supplying mechanism having a pair of first pinch rolls that sandwich the sheet and drivingly rotate in order to reel out the sheet from the sheet roll, and a first sensor that detects that an end of reeling out the sheet from the first sheet supplying mechanism is close; a second sheet supplying mechanism for reeling out and supplying a sheet from a sheet roll made by reeling up the sheet in a roll shape, the second sheet supplying mechanism having a pair of second pinch rolls that sandwich the sheet an drivingly rotate in order to reel out the sheet from the sheet roll, and a second sensor that detects that an end of reeling out the sheet from the second sheet supplying mechanism is close; a crusher for crushing the sheet into a fibrous matter by scraping a reeling-out tip end of the sheet that has been reeled out; and a fiber stacking device for forming the absorbent body in a predetermined shape by laminating the fibrous matter to be sent out from the crusher, wherein, when switching a supply of the sheet to the crusher from the first sheet supplying mechanism to the second sheet supplying mechanism, the controller controls the driving rotation of the first pinch rolls such that a reeling-out speed of the sheet from the first sheet supplying mechanism is decreased in a predetermined period, and controls the driving rotation of the second pinch rolls such that a reeling-out speed of the sheet from the second sheet suppying mechanism is increased in the predetermined period at least two sheet supplying mechanisms, wherein a first sheet supplying mechanism for reeling out and for supplying a sheet from a sheet roll made by reeling up the sheet in a roll shape, the first sheet supplying mechanism having a pair of first pinch rolls that sandwich the sheet and drivingly rotate in order to reel out the sheet from the sheet roll, and a first sensor that detects that an end of reeling out the sheet from the first sheet supplying mechanism is close; a second sheet supplying mechanism for reeling out and supplying a sheet from a sheet roll made by reeling up the sheet in a roll shape, the second sheet supplying mechanism having a pair of second pinch rolls that sandwich the sheet an drivingly rotate in order to reel out the sheet from the sheet roll, and a second sensor that detects that an end of reeling out the sheet from the second sheet supplying mechanism is close; a crusher for crushing the sheet into a fibrous matter by scraping a reeling-out tip end of the sheet that has been reeled out; and a fiber stacking device for forming the absorbent body in a predetermined shape by laminating the fibrous matter to be sent out from the crusher, wherein, when switching a supply of the sheet to the crusher from the first sheet supplying mechanism to the second sheet supplying mechanism, the controller controls the driving rotation of the first pinch rolls such that a reeling-out speed of the sheet from the first sheet supplying mechanism is decreased in a predetermined period, and controls the driving rotation of the second pinch rolls such that a reeling-out speed of the sheet from the second sheet suppying mechanism is increased in the predetermined period a first sheet supplying mechanism for reeling out and for supplying a sheet from a sheet roll made by reeling up the sheet in a roll shape, the first sheet supplying mechanism having a pair of first pinch rolls that sandwich the sheet and drivingly rotate in order to reel out the sheet from the sheet roll, and a first sensor that detects that an end of reeling out the sheet from the first sheet supplying mechanism is close; a second sheet supplying mechanism for reeling out and supplying a sheet from a sheet roll made by reeling up the sheet in a roll shape, the second sheet supplying mechanism having a pair of second pinch rolls that sandwich the sheet an drivingly rotate in order to reel out the sheet from the sheet roll, and a second sensor that detects that an end of reeling out the sheet from the second sheet supplying mechanism is close; a crusher for crushing the sheet into a fibrous matter by scraping a reeling-out tip end of the sheet that has been reeled out; and a fiber stacking device for forming the absorbent body in a predetermined shape by laminating the fibrous matter to be sent out from the crusher, wherein, when switching a supply of the sheet to the crusher from the first sheet supplying mechanism to the second sheet supplying mechanism, the controller controls the driving rotation of the first pinch rolls such that a reeling-out speed of the sheet from the first sheet supplying mechanism is decreased in a predetermined period, and controls the driving rotation of the second pinch rolls such that a reeling-out speed of the sheet from the second sheet suppying mechanism is increased in the predetermined period