[Problem] Provided are a production method for a multi-input/multi-output-type genetic switch or a transcription factor, and a multi-input/multi-output-type genetic switch or a transcription factor. [Solving Means] The inventors of the present invention have completed a production method for a multi-input/multi-output-type genetic switch or a transcription factor, essentially including the steps of “fusing two or more transcription factor genes to each other” and “introducing mutations into the fusion-type transcription factor gene,” and have further succeeded in obtaining a multi-input/multi-output-type genetic switch or a transcription factor by the method.