To provide a toner containing at least a toner base containing a binder resin and a colorant, and an inorganic fine particle, wherein the inorganic fine particle contains a compound oxide expressed by the following Composition Formula (1): [M1].sub.aSi.sub.bO.sub.c Composition Formula (1) where "M1" represents a metal element selected from Sr, Mg, Zn, Co, Mn and Ce, "a" and "b" each represents an integer of 1 to 9 and "c" represents an integer of 3 to 9, wherein an average primary particle diameter of the compound oxide is 0.02 .mu.m to 1.5 .mu.m, and an average secondary particle diameter of the compound oxide is 0.08 .mu.m to 3.5 .mu.m, where the secondary particle is an aggregate of the primary particles.