When being blended in a toner, a barium titanate external additive for toner enhances, in particular, the toner fluidity, electrical properties, and other relevant performance; concurrently achieves high image density and reduced background fog in a printer using the toner; and further reduces image defects, such as void, fading, and the like. An industrially advantageous producing method of the barium titanate external additive for toner is also provided. The external additive for toner of the present invention includes spherical barium titanate having a specific gravity of 5.6 g/ml or less.