Patent ID: 8507167

Claim:
A toner for developing an electrostatic image, comprising toner particles having a shape factor SF 1 of 110 or more and comprising a binder resin, and particles of an external additive that adhere to the toner particles, the particles of the external additive comprising first particles, the first particles being silica particles, and second particles which are adhered to the first particles and have a primary particle size of 0.2 times to 0.5 times as large as that of the first particles, and in an image obtained by observing the particles of the external additive with a microscope, when the projection surface area of the first particle is defined as S 1 and the total of the projection surface areas of the second particles which are not hidden by the first particle is defined as S 2 , S 2 being from 0.1 times to 0.5 times as large as S 1 .