Provided is a cutting tool (35), for machining differential cases, which is mounted to a machining device to cut the spherical inner surface of a differential case (10) and which is provided with: a shaft part (50); a cutting blade (51) protruding laterally from the shaft part (50); a fixing part (53) that is formed on one end side of the shaft part (50), and that is for fixing the shaft part (50) to the machining device; and a holding part (54) that is formed on the other end side of the shaft part (50), and that is for holding the shaft part (50) by the machining device, wherein the spherical inner surface of the differential case (10) that is rotating can be cut in a dual-supported state where both the fixing part (53) and the holding part (54) are supported on the machining device.
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