A processing apparatus 200 for a multicore cable 1 processes the multicore cable 1 including a sheath 2 and cores 3 and 4 inserted in the sheath 2, and includes: a slitter 21 that makes a slit along a circumferential direction; a puller 22 that moves at least one of a distal portion of the sheath 2 and a proximal portion of the sheath 2 in a longitudinal direction of the multicore cable 1 to thereby expose the core wires 3 and 4, the distal portion being closer to a distal end of the multicore cable 1 than the slit, the proximal portion being closer to a proximal end of the multicore cable 1 than the slit; a detector 31 that detects a position of a specific core 3 of the cores 3 and 4 in a circumferential direction of the multicore cable 1; and a rotator 32a that rotates the multicore cable 1 based on the detected position of the specific core 3 in the circumferential direction to thereby move the specific core 3 to a predetermined position in the circumferential direction.