The present invention relates to stable antibody-containing solution formulations in which aggregate formation of Emicizumab (ACE910) which is a bispecific antibody functionally substituting for FVIII, is suppressed. Specifically, the present invention relates to the above-mentioned antibody-containing solution formulations of pH 4.5 to 6.5 that contain the aforementioned bispecific antibody at 20 to 180 mg/mL, 10 mM to 40 mM histidine-aspartate buffer, Poloxamer 188 at 0.2 to 1 mg/mL, and 100 mM to 300 mM arginine.
