Toner

A toner, comprising:

• a toner particle containing a binder resin;
• the binder resin containing a polyester resin in an amount of at least 50 mass % of the binder resin;
• and
• the polyester resin including a polyester resin A having a structure represented by formula (1)
• where Rx is independently a hydrogen atom, methyl group or phenyl group,
• A represents a polyester segment,
• B represents a polyester segment or any functional group selected from the group consisting of —R20OH, —R20COOH,
• and —R20NH2,
• R20 represents a single bond or C1-4 alkylene group, and
• the average number of repetitions n is 10 to 80, wherein
• Y1=X1/Z1 (2)
• Y2=X2/Z2 (3)
• (Y1−Y2)/Y1≥0.50 (4)
• X1 is 0.5 to 20.0 atom %
• in analysis of the toner particle with an X-ray photoelectron spectrometer, when X is a ratio of the number of silicon atoms attributable to a silicone segment represented by (Si(Rx)2O)n—Si(Rx)2— in the structure represented by formula (1) in the polyester resin A relative to a total number of measured atoms (silicon atoms/total atoms×100), X1 is a value of X on a surface of the toner particle, and X2 is a value of X at a depth of 30 nm from the surface of the toner particle, and
• in analysis of the toner particle with an X-ray photoelectron spectrometer, when Z is a ratio of the number of carbon atoms attributable to ester bonds of the polyester resin relative to a total number of measured atoms (carbon atoms/total atoms×100), Z1 is a value of Z on the surface of the toner particle, and Z2 is a value of Z at a depth of 30 nm from the surface of the toner particle.