Toner

A toner comprising toner particles, wherein

• the toner particles each include a toner core containing a binder resin and a shell layer covering a surface of the toner core,
• the shell layers contain a branched macromolecule,
• the branched macromolecule includes a repeating unit having an oxazoline group,
• the branched macromolecule satisfies a relationship represented by rB/rL≤0.80, where rB represents a radius of gyration of the branched macromolecule when an absolute molecular weight of the branched macromolecule is 40,000, and rL represents a radius of gyration of a linear macromolecule including a main chain having the same structure as a main chain of the branched macromolecule when an absolute molecular weight of the linear macromolecule is 40,000,
• rB and rL are each a radius of gyration measured by gel permeation chromatography using a multi-angle laser light scattering detector,
• the binder resin includes a polyester resin,
• the repeating unit has an oxazoline group that is a repeating unit represented by formula (1-1) shown below,
• the branched macromolecule further includes a unit derived from a polymerization initiation group-containing compound,
• the polymerization initiation group-containing compound has three or more polymerization initiation groups in a molecule thereof, and
• the polymerization initiation groups are each represented by formula (A) shown below,
• where in formula (1-1), R1 represents a hydrogen atom or an alkyl group optionally substituted with a phenyl group,
• where in formula (A), an asterisk represents a site bonded to a portion of the polymerization initiation group-containing compound, the portion not being a polymerization initiation group.