A soy milk coagulating device includes: a coagulation vessel with an internal volume of 1,000 cc or less; two electrode plates facing each other to form a pair in the vessel; and a power feed controlling mechanism for controlling electricity fed to the electrode plates, and in the soy milk coagulating device, the power feed controlling mechanism is composed of: a tofu control system which is provided to heat soy milk to a set temperature at an average heating rate of equal to or less than 8 C. per minute, or at an average heating rate of more than 8 C. per minute and equal to or less than 15 C. per minute, and to keep the soy milk at the temperature for at least 5 minutes; a yuba control system; and switching unit which is provided to switch between the two control systems.