A device for changing cutting edges in a slitter stand which installs round edge knife disks (8, 51) each having an internal diameter portion, an external diameter portion and a cutting edge and round edge knife disks locating parts each having an internal diameter portion and an external diameter portion to upper slitter stand rotation axes (3; 61) and lower slitter stand rotation axes (3; 61) in a slitter stand, which shears a coiled form of a broad-wide material into a plurality of slit materials by catching the coiled form of the broad-wide material between the upper and lower slitter stand rotation axes (3; 61), comprising: a custody warehouse for storing various round edge knife disks (8, 51) and round edge knife disks locating parts by being provided on said upper and lower slitter stand rotation axes (3; 61) in accordance with classified groups; and a transfer device wherein a plurality of said round edge knife disks and/or round edge knife disks locating parts are combined and held, and transferred to the upper slitter stand rotation axes (3; 61) and/or lower slitter stand rotation axes (3; 61) to be built in, and a plurality of said round edge knife disks and/or round edge knife disks locating parts are held with being combined, and transferred back to the custody warehouse from the upper slitter stand rotation axes (3; 61) and/or lower slitter stand rotation axes (3; 61), and characterized in that the custody warehouse has a plurality of shelves for storing each of the round edge knife disks and/or round edge knife disks locating parts substantially vertically on at least a pair of rails whose opposing surfaces are tapered such that the interval of the opposing surfaces become wider as they are close to upward, the transfer device comprises a robotic hand adapted to hold a plurality of the round edge knife disks (8, 51) and round edge knife disks locating parts by holding their internal diameter portion by at least three places in a balanced manner, and an articulated robot arm, which is able to transfer said round edge knife disks (8, 51) and round edge knife disks locating parts to a predetermined position from the custody warehouse, the robotic hand is adapted to enter the internal diameter portion of the round edge knife disks and/or round edge knife disks locating parts stored substantially vertically and has a plurality of fingers configured to hold a plurality of round edge knife disks and/or round edge knife disks locating parts at one time, and the robotic hand is configured to hold the round edge knife disks and/or round edge knife disks locating parts one after another from the plurality of shelves in accordance with a schedule of installation of the round edge knife disks and/or round edge knife disks locating parts. a custody warehouse for storing various round edge knife disks (8, 51) and round edge knife disks locating parts by being provided on said upper and lower slitter stand rotation axes (3; 61) in accordance with classified groups; and a transfer device wherein a plurality of said round edge knife disks and/or round edge knife disks locating parts are combined and held, and transferred to the upper slitter stand rotation axes (3; 61) and/or lower slitter stand rotation axes (3; 61) to be built in, and a plurality of said round edge knife disks and/or round edge knife disks locating parts are held with being combined, and transferred back to the custody warehouse from the upper slitter stand rotation axes (3; 61) and/or lower slitter stand rotation axes (3; 61), and characterized in that the custody warehouse has a plurality of shelves for storing each of the round edge knife disks and/or round edge knife disks locating parts substantially vertically on at least a pair of rails whose opposing surfaces are tapered such that the interval of the opposing surfaces become wider as they are close to upward, the transfer device comprises a robotic hand adapted to hold a plurality of the round edge knife disks (8, 51) and round edge knife disks locating parts by holding their internal diameter portion by at least three places in a balanced manner, and an articulated robot arm, which is able to transfer said round edge knife disks (8, 51) and round edge knife disks locating parts to a predetermined position from the custody warehouse, the robotic hand is adapted to enter the internal diameter portion of the round edge knife disks and/or round edge knife disks locating parts stored substantially vertically and has a plurality of fingers configured to hold a plurality of round edge knife disks and/or round edge knife disks locating parts at one time, and the robotic hand is configured to hold the round edge knife disks and/or round edge knife disks locating parts one after another from the plurality of shelves in accordance with a schedule of installation of the round edge knife disks and/or round edge knife disks locating parts.