To provide a method and apparatus for repairing a tape of shell of a can capable of simply invalidating an unnecessary portion of the patching tape, and capable of positively cutting the repaired tape stuck on the shell of the can and of suitably waiting ready for the shell to be transferred next.

A tape-applying portion is provided in its tracks on a transfer channel 4B for sticking-on and a pair of outer rollers 81 and inner rollers 82 that rotate in the feeding direction of the can shell, sandwiching the welding seam portion of the can shell 1 being transferred both from the outside and the inside are provided. The outer roller 81 is driven by a motor connected through a power transmission mechanism. The tape-applying portion comprises a tape guide portion 9 and a clamp roller 83.