An object of the present invention is to provide a manufacturing method of black vinegar which contains sugar derived from rice and barley abundantly, and is free from precipitation, and black vinegar manufactured by the method.The present invention provide a manufacturing method of black vinegar having the sugar content of 8-50 weight/volume % derived from rice and/or barley, wherein acetic acid fermentation is performed by mixing a saccharified solution and an alcoholic fermented broth of rice and/or barley, and the final concentration of oxalic acid in black vinegar is 36 ppm or less, and preferably 30 ppm or less.In addition, as a decreasing method of oxalic acid in black vinegar, storing with stirring a saccharified solution of rice and/or barley or a fermented broth after completion of acetic acid fermentation is effective. And the present invention provides black vinegar manufactured by these methods in which oxalate precipitation is hardly to occur, and which is suitable for drinking.