PURPOSE: To readily condense fermentated vinegar without fail while keeping aroma peculiar to vinegar by carrying out the condensation during a process in which the fermentated vinegar is allowed to flow down along the surface of a freezing chamber body to freeze and make adhere water thereto.

CONSTITUTION: Fermentated vinegar is allowed to flow down out of holes 2 for flow down through a pipe 1 from a tank (T). As the vinegar flowing down is cooled to about -30°C by bent cooling pipes 7 equipped in a freezing chamber 3 during flowing down from the upper surface of the freezing chamber 3 equipped under the pipe 1 along both sides thereof. Water is frozen and made to adhere to the freezing chamber 3 during flowing down along both sides of the freezing chamber 3. Thereby the fermentated vinegar is allowed to flow down while being condensed, collected in a receiving bath 8 and subsequently accommodated in a receiving tank. A simple equipment is used and operation thereof is ready. In addition, the efficiency of operation is high and an objective concentrated vinegar of high quality is obtained.