The present invention is to provide a carrier and a developer, which have
fewer occurrences of carrier adhesion and background smear, excellent
granularity and longer durability. The carrier comprises the core
material particles having magnetism and resin coating layer covering the
core material particles, and wherein the weight average particle
diameters is in the range of 22 m to 32 m, the proportion of the weight
average particle diameters relative to the number average particle
diameter is in the range of 1.00 to 1.20, the content of particles having
a diameter of 20 m or smaller is 7% by mass, the content of carrier
particles having a diameter of 36 m or smaller is in the range of 90% by
mass to 100% by mass, and the proportion of the particle density of the
core material particles is in the range of 85% to 100% of the true
density of the core material particles.