Toner

PROBLEM TO BE SOLVED: To provide a toner which achieves environmental stability, durability and low-temperature fixability.SOLUTION: There is provided a toner which has a core containing a core resin, a coloring agent and a wax, and toner particles of a core-shell structure having a shell layer containing a resin A on the surface of the core, where the resin A contains a site having an organic polysiloxane structure, an amount of Si of the toner particles which is measured by X-ray photoelectron spectroscopy and is derived from an organic polysiloxane structure is 6.0 or more and 10.0 or less, the resin A is a polymer of a monomer composition containing a monomer containing two or more polymerizable unsaturated groups in one molecule, and the monomer satisfies an expression (1) of (Xa-1.0)×Ya≥3.0×10.SELECTED DRAWING: None