PROBLEM TO BE SOLVED: To cultivate mashrooms, to improve the form of a sporophore and a harvesting quantity and to obtain high quality mashrooms by seeding mashroom spawns in a medium and raising the sporophores under a specified condition. SOLUTION: The mashroom spawns are seeded in the sterilized medium, the mashroom funguses are predominantly culativated in the medium while preventing the contamination of various germs, the medium where the mashroom spawns are predominantly cultivated is contained in a synthetic resin-made culativating bag where thickness is 10-50μm and also multiple 0.10-0.45 mm diameter holes are formed in a part which forms in-bag upper space by the proportion of 0.001-0.02% surface opening rate in a state where in-bag upper space corresponding to the one to four-time capacity of the medium is formed, the mashroom funguses are sufficiently cultivated, a stimulation is given to the clutivated mashroom funguses so as to generate the sporophores, the sporophores are raised and, then, the mashrooms are clutivated. Preferably, the medium after harvesting the sporophores is contained in a cultivating bag, the mashroom funguses are sufficiently reculativated, the stimulation is given to the mashroom funguses so as to regenerate the sporophores and the sporophores are raised so as to harvest them.
