An electrical wire processing device that processes an electric wire having a core wire and a covering that covers a periphery of the core wire, the electrical wire processing device comprising: a pair of cutting blades (40A,40B) capable of cutting the electrical wire and circumferentially notching the covering; and a slit blade (43A, 43B) capable of slitting the covering in a longitudinal direction of the electrical wire; characterized in that the slit blade (43A, 43B) is disposed farther in the one side or the other side in the longitudinal direction of the electrical wire than the cutting blades (40A,40B); the electrical wire processing device further comprising: a pair of first stripping blades (41A,41B) disposed farther in one side in the longitudinal direction of the electrical wire than the cutting blades (40A,40B) and capable of circumferentially notching the covering; a pair of second stripping blades (42A,42B) disposed farther in the other side in the longitudinal direction of the electrical wire than the cutting blades (40A,40B) and capable of circumferentially notching the covering; and a slit blade actuator (35A,35B) that moves the slit blade (43A, 43B) between a slit position in which the slit blade (43A, 43B) comes closer to the electrical wire than the cutting blades (40A,40B), the first stripping blades (41A,41B), and the second stripping blades (42A,42B) and a retraction position in which the slit blade (43A, 43B) goes farther from the electrical wire than the cutting blades (40A,40B), the first stripping blades (41A,41B), and the second stripping blades (42A,42B). a pair of cutting blades (40A,40B) capable of cutting the electrical wire and circumferentially notching the covering; and a slit blade (43A, 43B) capable of slitting the covering in a longitudinal direction of the electrical wire; characterized in that the slit blade (43A, 43B) is disposed farther in the one side or the other side in the longitudinal direction of the electrical wire than the cutting blades (40A,40B); the electrical wire processing device further comprising: a pair of first stripping blades (41A,41B) disposed farther in one side in the longitudinal direction of the electrical wire than the cutting blades (40A,40B) and capable of circumferentially notching the covering; a pair of second stripping blades (42A,42B) disposed farther in the other side in the longitudinal direction of the electrical wire than the cutting blades (40A,40B) and capable of circumferentially notching the covering; and a slit blade actuator (35A,35B) that moves the slit blade (43A, 43B) between a slit position in which the slit blade (43A, 43B) comes closer to the electrical wire than the cutting blades (40A,40B), the first stripping blades (41A,41B), and the second stripping blades (42A,42B) and a retraction position in which the slit blade (43A, 43B) goes farther from the electrical wire than the cutting blades (40A,40B), the first stripping blades (41A,41B), and the second stripping blades (42A,42B). a pair of first stripping blades (41A,41B) disposed farther in one side in the longitudinal direction of the electrical wire than the cutting blades (40A,40B) and capable of circumferentially notching the covering; a pair of second stripping blades (42A,42B) disposed farther in the other side in the longitudinal direction of the electrical wire than the cutting blades (40A,40B) and capable of circumferentially notching the covering; and a slit blade actuator (35A,35B) that moves the slit blade (43A, 43B) between a slit position in which the slit blade (43A, 43B) comes closer to the electrical wire than the cutting blades (40A,40B), the first stripping blades (41A,41B), and the second stripping blades (42A,42B) and a retraction position in which the slit blade (43A, 43B) goes farther from the electrical wire than the cutting blades (40A,40B), the first stripping blades (41A,41B), and the second stripping blades (42A,42B).