A method for producing tofu is described which includes the step of detecting the concentration of a coagulant in soybean milk. The coagulant concentration is detected by a coagulant concentration detector disposed downstream of a stirring apparatus in a soybean milk transfer circuit. The amount of addition of the coagulant is controlled by a coagulant concentration adjuster in accordance with the coagulant concentration detected by the coagulant concentration detector. This enables the mass production of tofu having a bouncy taste and excellent flavor.