An electrical wire processing device (1) includes a pair of cutting blades (40A, 40B) capable of cutting an electrical wire (5) and circumferentially notching a covering (5b), a slit blade (43A, 43B) disposed farther in one side in a longitudinal direction (CL) of the electrical wire (5) than the cutting blades (40A, 40B) and capable of slitting the covering (5b) in the longitudinal direction (CL) of the electrical wire (5), 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 (5) than the cutting blades (40A, 40B) and a retraction position in which the slit blade (43A, 43B) goes farther from the electrical wire (5) than the cutting blades (40A, 40B).