Even if the carbon fiber reinforced resin is not heated at 800 ° C. or higher, the carbon fiber base material can be recovered as it is contained in the carbon fiber reinforced resin, and the resin residue content in the recovered carbon fiber base material The present invention provides a method for producing regenerated carbon fibers that can reduce the variation in carbon fiber, an apparatus for producing regenerated carbon fibers that can be used for the production method, and a method for producing a carbon fiber reinforced resin that can effectively use regenerated carbon fibers. A carbon fiber reinforced resin (100) comprising a plurality of sheet-like carbon fiber bases and a matrix resin is a method of obtaining a carbon fiber base as a regenerated carbon fiber bundle; the matrix by heating the carbon fiber reinforced resin (100) The resin is pyrolyzed to obtain a heat-treated product (102); a plurality of carbon fiber substrates are separated into individual regenerated carbon fiber bundles by crushing the heat-treated product (102); Production method.
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