PURPOSE: To obtain a vessel-packed soybean curd having good release from a vessel without causing deterioration of quality and unevenness of solidification by previously heating soymilk taken out from a temperature-retaining tank to a specific temperature before blending the soymilk with a solidifying agent.

CONSTITUTION: Soymilk fed from a soymilk tank 14 through a main conduit 13 into a packing machine 12 is passed through a preheated heat exchanger 18 on the way. The preheating is carried out at 1830°C before blending with a solidifying agent. In the case the temperature of soymilk being 7°C, when hot water heated to 28°C is used, the soymilk which passed through the heat exchanger 18 is pre-heated to about 25°C. When the solidifying agent is fed through a sub-conduit 16 to a mixer 15, the preheated soymilk is blended with the solidifying agent, and then the mixed liquid is immediately fed to the packing machine 12. A sealed vessel discharged from a germ-free chamber 11 is dipped in a hot water tank, and the mixed liquid is solidified in the sealed vessel by heating the vessel at about 80°C for 30min to provide the objective soybean curd.