PURPOSE: To always obtain bread of the constant quality by constituting the machine so that a temperature of bread material does not rise higher than a prescribed value at the time when an environmental temperature is low, in a fermenting process, with regard to the automatic bread baking machine utilized at home.

CONSTITUTION: This machine is provided with a bread baking mold 3 with a kneading blade for putting a bread baking material therein, and a driving source 4 for rotating the kneading blade 2 and executing mixing, kneading and cooking, a heat source 5 for executing heating cooking, a temperature detecting device 6 for detecting a temperature in a baking chamber, an electric power changing device 7 for varying electric power supply to the heat source, and a controller 8 for controlling them, and in a fermenting process, the electric power supply quantity is set to a low quantity, when an environmental temperature is below a prescribed temperature in order that a bread material temperature holds a prescribed fermenting temperature.