To provide a cutting device for a metal thin sheet drum, automatically supplying the drum.

The cutting device 1 for a metal thin sheet drum is provided with: a drum supply means 3; a drum holding member 4; and a cutter 5 held on the drum holding member 4 for cutting the drum 2, so that the drum 2 is circumferentially cut into a predetermined width. The drum supply means 3 is provided with: an inclined carrying passage 11 with a downstream end part that is located lower than an upstream end part, so that the drum 2 rolls to be carried from the upstream side to the downstream side by its weight; a rolling control means 15 provided on the downstream side of the inclination carrying passage 11; a placement member 12 for placing the drum 2 discharged from the inclination carrying passage 11 to be placed; and a moving means 13 to move the drum 2 placed on the placement member 12 to a position where the drum is held by the drum holding member 4. The drum supply means 3 is provided with the plurality of inclined carrying passages 11 in the vertical direction. Mutually adjoining inclined carrying passages 11 are provided with inclination in mutually opposite directions, and are provided at an interval in which the drum 2 can pass.