A burr removal device for removing burrs formed by fusing cast steel parts or rolled steel parts, the burr removal device comprising: a deburring blade that is disc-shaped and configured to remove burrs by being vibrated along a plane in contact with a lower edge line of a fusion-cut surface of a cast steel part or a rolled steel part to forcefully scrape off the burrs; a blade seat that is disposed in contact with a lower surface of the deburring blade and that serves as a seat for the deburring blade; a blade seat support base that supports the blade seat; an arm having the blade seat support base at a distal end thereof; and an arm vibration elevation drive unit that is configured to move the arm upward and downward, cause the arm to extend and contract, and vibrate the arm along the plane in contact with the lower edge line of the fusion-cut surface of the cast steel part or the rolled steel part, wherein the blade seat support base has a hollow cylindrical shape, and at least a portion of the blade seat has an outer dimension greater than an inside diameter of the blade seat support base, wherein a lower portion of the blade seat serves as a fitting unit that is inserted in the hollow space in the blade seat support base, wherein the blade seat including the fitting unit is integrated with the deburring blade by a bolt, that extends through the blade seat and the deburring blade and a nut, that is fastened to the bolt,, and wherein the fitting unit is capable of being inserted into and removed from the hollow space in the blade seat support base, and the deburring blade is disposed at a predetermined position when the fitting unit is inserted in the hollow space in the blade seat support base. a deburring blade that is disc-shaped and configured to remove burrs by being vibrated along a plane in contact with a lower edge line of a fusion-cut surface of a cast steel part or a rolled steel part to forcefully scrape off the burrs; a blade seat that is disposed in contact with a lower surface of the deburring blade and that serves as a seat for the deburring blade; a blade seat support base that supports the blade seat; an arm having the blade seat support base at a distal end thereof; and an arm vibration elevation drive unit that is configured to move the arm upward and downward, cause the arm to extend and contract, and vibrate the arm along the plane in contact with the lower edge line of the fusion-cut surface of the cast steel part or the rolled steel part, wherein the blade seat support base has a hollow cylindrical shape, and at least a portion of the blade seat has an outer dimension greater than an inside diameter of the blade seat support base, wherein a lower portion of the blade seat serves as a fitting unit that is inserted in the hollow space in the blade seat support base, wherein the blade seat including the fitting unit is integrated with the deburring blade by a bolt, that extends through the blade seat and the deburring blade and a nut, that is fastened to the bolt,, and wherein the fitting unit is capable of being inserted into and removed from the hollow space in the blade seat support base, and the deburring blade is disposed at a predetermined position when the fitting unit is inserted in the hollow space in the blade seat support base.