PURPOSE: To obtain the toner which has sufficiently large electrostatic chargeability, is sufficiently less changed in the electrostatic charge quantity with lapse of time during use and is suitable for color images by incorporating the independent polymer of a specific compd. or the copolymer of this compd. and a vinyl compd. into the toner.

CONSTITUTION: The toner contains the independent polymer of the compd. expressed by formula or the copolymer of this compd. and the vinyl compd. The content of the compd. expressed by the formula in the copolymer in this case is preferably specified to ≥3wt.% and further, the content of the compd. expressed by the formula in the total resin component in the toner is preferably specified to ≥1wt.%. In the formula I, R1 denotes H or CH3; X denotes O or NH; R2 and R3 are the same or different, 1 to 4C alkyl group; n denotes 2 to 5 integer. The toner which has the sufficiently large electrostatic chargeability, is sufficiently less changed in the electrostatic charge quantity with lapse of time during use and is suitable for the color images is obtd. in this way.