A toner having good development durability, storage stability, environmental stability, and low-temperature fixability is provided. The toner contains toner particles each including a surface layer that contains an organic silicon polymer. The organic silicon polymer contains a specific unit. In a chart obtained by 29Si-NMR measurement of THF insoluble components of the toner particles, the ratio of a peak area attributable to a specific structure to the total peak area of the organic silicon polymer is 0.40 or more.