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 transfu sion solutions i s given and multiple kinds 0 1 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 b e opened, wherein: a first chamber transfusion solution containing a sugar and a fat emulsion i s accommodated in a first chamber a second chamber transfusion solution containing amino acids and electrolytes i s accommodated in a second chamber the first chamber transfusion solution contains substantially n o potassium and has an osmotic pressure ratio of 2.0-3.0 for the second chamber transfusion solu tion, the potassium concentration i s 40 mEq/L or less and the osmotic pressure ratio i s 2.5-3.5 and the potassium concentration of mEq/L or more.
