A toner for electrostatic charge image development includes: a toner base particle containing a binder resin; and an external additive containing a strontium titanate fine particle, wherein the binder resin contains an amorphous resin and a crystalline polyester resin, in which the crystalline polyester resin is a polycondensate of an aliphatic dicarboxylic acid having from 6 to 14 carbon atoms and an aliphatic diol having from 6 to 14 carbon atoms, and the strontium titanate fine particle contains a strontium titanate fine particle (A) and a strontium titanate fine particle (B), in which a particle diameter R.sub.A of a peak top in number particle size distribution of the strontium titanate fine particle (A) is smaller than a particle diameter R.sub.B of a peak top in number particle size distribution of the strontium titanate fine particle (B).

A toner for developing an electrostatic image including a binder resin, a coloring agent, and a releasing agent are provided. A particle of the toner satisfies conditions of Equation (1) (W.sub.(L)/T.sub.(L)0.1 and Equation (2) 15<N.sub.stain, where N.sub.stain refers to a number of stained releasing agent domains when the particle of the toner is stained with ruthenium tetraoxide (RuO.sub.4) and a cross section of the particle of the toner is observed, W.sub.(L) refers to a longest length of lengths of the stained releasing agent domains, and T.sub.(L) refers to a longest length of the cross section of the particles of the toner.

Provided is a two-component developer for developing an electrostatic latent image incorporating: toner particles each containing a toner mother particle having an external additive on a surface of the toner mother particle; and carrier particles each having a core material particle and a covering layer containing a resin on a surface of the core material particle, wherein the external additive contains inorganic particles; the inorganic particles are subjected to surface modification with silicone oil; a carbon content remained on a surface of the inorganic particle after the surface modification is within 3.0 to 10.0 mass %; a free carbon ratio on the surface of the inorganic particle is 70.0% or more; the carrier particles have a resistance in the range of 1.010.sup.9 to 5.010.sup.10 .Math.cm; and the resin in the covering layer contains a resin formed from a monomer containing an alicyclic methacrylic acid ester monomer.

A toner includes toner particles each including a toner mother particle and external additive particles attached to the surface of the toner mother particle. The external additive particles include fluororesin particles, specific external additive particles, and silica particles. The specific external additive particles contain barium titanate or strontium titanate. The silica particles have a detachment fraction of at least 5% by mass and no greater than 22% by mass. The detachment fraction of the silica particles is a percentage of a mass M.sub.2 of silica particles of the silica particles that have separated from the toner mother particles after ultrasonication to a mass M.sub.1 of the silica particles included in the toner particles before the ultrasonication. The ultrasonication is application of ultrasonic vibration to a mixed liquid of 5 g of the toner and 105.5 g of a nonionic surfactant-containing aqueous solution containing 0.55 g of a nonionic surfactant.

Provided is an electrostatic charge image developing toner including: toner particles; and strontium titanate particles A and strontium titanate particles B having different average primary particle diameters from each other. The strontium titanate particles B have an average primary particle diameter Db of 10 nm to 100 nm. An average primary particle diameter Da of the strontium titanate particles A and the average primary particle diameter Db of the strontium titanate particles B satisfy a relationship of 10Da/Db100.

An electrostatic charge image developing toner has a surface property index value represented by Formula S of 2.0 to 2.8, an electrostatic charge image developing toner has a surface property index value represented by Formula S of more than 2.8 and 3.5 or less, and an electrostatic charge image developing toner has a surface property index value represented by Formula S of more than 1.0 and less than 2.0 and a calculated value of a specific surface area in Formula S of 0.70 to 1.3:

(Surface property index value)=(Measured value of specific surface area)/(Calculated value of specific surface area)Formula S wherein (Calculated value of specific surface area)=(Sum of surface areas calculated from equivalent circle diameters of 4,500 toner particles in flow type particle image analysis)/{((Specific gravity of toner)(Sum of volumes calculated from equivalent circle diameters of 4,500 toner particles in flow type particle image analysis)}.

An electrostatic image developing toner includes a toner particle and an external additive. The toner particle contains a binder resin and a release agent that includes a hydrocarbon wax. The binder resin includes a vinyl resin and a hybrid resin in which an amorphous resin unit other than polyester resins and a crystalline polyester resin unit are chemically bound together. The toner particle has hybrid resin domains and release agent domains. An average distance Lhyb from the surface of the toner particle to the centers of the hybrid resin domains and an average distance Lwax from the surface of the toner particle to the centers of the release agent domains satisfy Lwax<Lhyb.

Provided is a toner containing: a toner particle containing a binder resin; and an inorganic particle, wherein the inorganic particle contains a silicon oxide particle with a number-average particle diameter (D1) from 50 nm to 300 nm and a strontium titanate particle with a number-average particle diameter (D1) from 10 nm to 60 nm, the content of the silicon oxide particle is from 0.5 to 15.0 mass parts per 100 mass parts of the toner particle, the content of the strontium titanate particle is from 0.02 to 5.00 times the content of the silicon oxide particle, and in dielectric constant measurement at 25 C. and 1 MHz, the dielectric constant of the silicon oxide particle is from 1.0 pF/m to 20.0 pF/m, and the dielectric constant of the strontium titanate is from 25.0 pF/m to 100.0 pF/m.

An electrostatic charge image developing toner includes: a toner particle and a strontium titanate particle that is externally added to the toner particle, in which an average primary particle diameter of the strontium titanate particle that is present on a surface of the toner particle is 30 nm or more and 100 nm or less, and average primary particle circularity is 0.82 or more and 0.94 or less, and in which circularity that becomes 84% of accumulation of the primary particle is greater than 0.92.

A toner includes a plurality of toner particles and a plurality of lubricant particles. The lubricant particles each include a core and a coat layer covering a surface of the core. The core contains stearic acid, palmitic acid, or a combination thereof. The coat layer has a thickness of at least 10 nm and no greater than 50 nm.