Cooker

It is an object of the invention to provide a cooking apparatus which can set the interior of a heating chamber at desired humidity and temperature in a short time. In the cooking apparatus, an object to be heated 11 is stored into a heating chamber 12, the interior of the heating chamber 12 is heated up to a given temperature using heating chamber interior heating means 13, and water supplied to a storage part 17 formed within the heating chamber by water supply means 16 is heated using storage part heating means 18 to thereby generate and supply steam. At the then time, based on the temperature of the interior of the heating chamber detected by heating chamber interior temperature detect means 20, a control part 19 controls the storage part heating means 18 in such a manner that the water in the storage part 17 is prevented from boiling on, before the steam is supplied. That is, since, by supplying the steam not boiling, the supply of the steam can be executed without increasing the temperature of the interior of the heating chamber, the excessive progress of fermentation can be prevented and thus the proper fermentation can be carried out.