Toner

A toner comprising:

• a toner particle comprising a binder resin;
• and a silica aggregated particle, wherein,
• in TOF-SIMS measurement of the toner particle, a fragment peak derived from a boron atom and a fragment peak derived from a boron-oxygen structure are detected;
• the silica aggregated particle is an aggregated particle of silica fine particles having a primary particle size based on number of from 20 to 75 nm,
• a maximum Feret's diameter of the silica aggregated particle is from 110 to 500 nm, and
• an aspect ratio of the silica aggregated particle is from 1.50 to 4.00;
• and
• when the silica aggregated particle is dispersed in a solvent and a titration operation is performed with the use of an aqueous solution of NaOH, the following Expression (1) is satisfied:
• 0.01≤[(a−b)×c×NA]/(d×e)≤0.20 (1),
• (wherein a is a titration amount (L) of an aqueous solution of NaOH necessary for adjusting a mixed liquid of 25.0 g of ethanol and 75.0 g of an aqueous solution of 20% by mass of NaCl in which the silica aggregated particle is dispersed, to pH 9,
• b is a titration amount (L) of the aqueous solution of NaOH necessary for adjusting a mixed liquid of 25.0 g of ethanol and 75.0 g of the aqueous solution of 20% by mass of NaCl, to pH 9,
• c is a concentration (N) of the aqueous solution of NaOH used for the titration,
• NA is Avogadro's number,
• d is a mass (g) of the silica aggregated particle, and
• e is a BET specific surface area (nm2/g) of the silica aggregated particle).