Production method for carbon heat source

A production method for a carbon heat source, the production method including a step (A1) that is for forming a first groove while a plurality of carbon members are arranged in a row, a step (A2) that follows the step (A1) and that, while the plurality of carbon members are arranged in a row, is for modifying the orientation of the plurality of carbon members such that the first groove that is formed in the plurality of carbon members intersects a first prescribed direction, and a step (A3) that follows the step (A2) and that is for forming a second groove while the plurality of carbon members are arranged in a row.