External additive for toner and toner

A toner comprising:

• a toner particle;
• and
• an external additive for toner,
• wherein the external additive for toner includes an external additive particle containing:
• a base particle A;
• and
• a plurality of convex forming particles B each configured to form a convex portion on a surface of the base particle A,
• wherein the base particle A and the plurality of convex forming particles B are particles each containing a silicon compound having a siloxane bond, and a chemical bond is formed between the base particle A and each of the plurality of convex forming particles B,
• wherein the base particle A has a total content of the following unit (a), unit (b), and unit (c) of 80 mass % or more and 100 mass % or less,
• wherein the plurality of convex forming particles B each have a total content of the following unit (a), unit (b), and unit (c) of 80 mass % or more and 100 mass % or less,
• wherein the external additive for toner has a Young's modulus of 10 GPa or more and 30 GPa or less,
• wherein the external additive for toner has a number-average particle diameter of 0.03 μm or more and 0.30 μm or less, and
• wherein, when the number-average particle diameter of the external additive for toner is represented by DA, and an average height of the convex portions derived from the plurality of convex forming particles B on a surface of the external additive particle is represented by H, H/DA is 0.10 or more and 0.30 or less:
• where R1 and R2 each represent an alkyl group having 1 or more and 6 or less carbon atoms.