Repair capacity is broader than repair ships

How many repair ships did the Imperial Japanese Navy have?

It depends on the definition: Japan had dedicated repair ships, but depot and stores ships also contributed repair capability.

The answer distinguishes dedicated repair vessels from the wider maintenance capacity of a fleet train. Specialist repair ships offered concentrated workshops and expertise, but depot ships and store ships could also carry tools, parts, and personnel able to keep other vessels operating. Japan had relatively few of the former and more of the latter, a pattern also visible in other navies. Counting only ships whose formal type says repair therefore understates real maintenance capacity. Comparisons should ask what work the whole support force can perform, not simply how many vessels appear under one label.