To provide a method for artificially cultivating mushroom having symbiotic relationship with other plants.

This method for cultivating mushroom comprises a process of sterilizing a medium, a process of inoculating spawn to the sterilized medium, and a process of adding to the medium a unicellular liquid object of plants having the symbiotic relationship with the inoculated spawn. The method further comprises a process of breeding the spawn in a culture room that is controlled to be a condition suitable for raising the inoculated spawn of mushroom and a process of adding to the medium one time or a plurality of times a liquid object obtained by subjecting carpophore to enzymolysis.