[project] provides the mixed water injection device that can efficiently perform the processing of the mixed water injection including the mixing engineering for stirring drug. [solution] mixed water injection device 1, the mixed water injection processing unit 300 that the mixed water injection for the drug for inject in the 2nd container in the 1st container according to modulation data is handled, stirring Stirring device is used in the agitating procedure being stirred with the drug in the processing of above-mentioned mixed water injection in above-mentioned 1st container that stirs for device 32, according to mixed water injection described in above-mentioned modulation data processing execution start timing, can the above-mentioned mixed water injection based on above-mentioned modulation data processing included in stir agitating procedure. [selection figure] Figure 22
