Provided is a method for producing a barium titanate powder comprising: a step of adding a water slurry of an anatase type hydrous titanium oxide, which has a BET specific surface area in the range of 200-400 m2/g and a diffraction peak at half height of a face (101) as measured by X-ray diffraction in the range of 2.3-5.0 DEG, to a barium hydroxide aqueous solution while keeping the temperature of the solution from 80 DEG to boiling point under normal pressure, and reacting the barium hydroxide and hydrous titanium oxide to obtain a water slurry of a barium titanate precursor; and a step of subjecting the obtained barium titanate precursor to a hydrothermal treatment for 24 hours or more to obtain barium titanate particles.