A manufacturing apparatus of a hot-rolled steel sheet comprising: a row of hot finishing mills; an immediate rapid-cooling device, which is disposed on an exit side of a final stand in the row of hot finishing mills, and at least a part of which is disposed inside the final stand so as to be capable of spraying cooling water; a device for measuring a temperature on an entry side of a final stand, which is arranged in a manner capable of measuring a surface temperature of a steel sheet on an entry side of the final stand; a device for measuring a temperature on an exit side of the immediate rapid-cooling device, which is arranged in a manner capable of measuring the surface temperature of the steel sheet on the exit side of the immediate rapid-cooling device, characterized in a device for measuring a steel sheet passing speed, which is arranged in a manner capable of measuring a passing speed of the steel sheet on the entry side of the final stand; a device for predicting a rapid-cooling stopping temperature, which is adapted to calculate a predicted rapid-cooling stopping temperature based on the surface temperature of the steel sheet measured by the device for measuring a temperature on an entry side of the final stand, the steel sheet passing speed measured by the device for measuring a steel sheet passing speed, and the water supply volume or water supply pressure of the immediate rapid-cooling device; and an immediate rapid-cooling control device, which is adapted to correct the water supply volume or water supply pressure of the immediate rapid-cooling device such that the predicted rapid-cooling stopping temperature matches a targeted rapid-cooling stopping temperature, until a top portion of the steel sheet passes through the immediate rapid-cooling device, and which is adapted to correct the water supply volume or water supply pressure of the immediate rapid-cooling device, or the steel sheet passing speed such that the temperature measured by the device for measuring a temperature on the exit side of the immediate rapid-cooling device matches the targeted rapid-cooling stopping temperature, after the top portion of the steel sheet passes through the immediate rapid-cooling device. a row of hot finishing mills; an immediate rapid-cooling device, which is disposed on an exit side of a final stand in the row of hot finishing mills, and at least a part of which is disposed inside the final stand so as to be capable of spraying cooling water; a device for measuring a temperature on an entry side of a final stand, which is arranged in a manner capable of measuring a surface temperature of a steel sheet on an entry side of the final stand; a device for measuring a temperature on an exit side of the immediate rapid-cooling device, which is arranged in a manner capable of measuring the surface temperature of the steel sheet on the exit side of the immediate rapid-cooling device, characterized in a device for measuring a steel sheet passing speed, which is arranged in a manner capable of measuring a passing speed of the steel sheet on the entry side of the final stand; a device for predicting a rapid-cooling stopping temperature, which is adapted to calculate a predicted rapid-cooling stopping temperature based on the surface temperature of the steel sheet measured by the device for measuring a temperature on an entry side of the final stand, the steel sheet passing speed measured by the device for measuring a steel sheet passing speed, and the water supply volume or water supply pressure of the immediate rapid-cooling device; and an immediate rapid-cooling control device, which is adapted to correct the water supply volume or water supply pressure of the immediate rapid-cooling device such that the predicted rapid-cooling stopping temperature matches a targeted rapid-cooling stopping temperature, until a top portion of the steel sheet passes through the immediate rapid-cooling device, and which is adapted to correct the water supply volume or water supply pressure of the immediate rapid-cooling device, or the steel sheet passing speed such that the temperature measured by the device for measuring a temperature on the exit side of the immediate rapid-cooling device matches the targeted rapid-cooling stopping temperature, after the top portion of the steel sheet passes through the immediate rapid-cooling device.