The invention addresses the problem of providing a transfusion preparation, wherein: Maillard reactions due to reducing sugars and amino acids do not occur during storage； fat droplet size in the fat emulsion does not increase during storage； there is little danger of the patient developing hyperkalemia or experiencing vascular pain or phlebitis even when only one of the transfusion solutions is given； and multiple kinds of vitamins can be blended stably despite being a two-chambered container preparation. The invention provides a transfusion preparation having two chambers that are separated by a partition that can be opened, wherein: a first chamber transfusion solution containing a sugar and a fat emulsion is accommodated in a first chamber； a second chamber transfusion solution containing amino acids and electrolytes is accommodated in a second chamber； the first chamber transfusion solution contains substantially no potassium and has an osmotic pressure ratio of 2.0-3.0； for the second chamber transfusion solution, the potassium concentration is 40 mEq/L or less and the osmotic pressure ratio is 2.5-3.5； and the potassium concentration of the mixture of the first chamber transfusion solution with the second chamber transfusion solution when the partition is opened is 16 mEq/L or more.
