A toner includes toner particles which have a binder resin and a colorant. The toner has a weight average particle diameter of from 4 to 7 .mu.m and includes toner particles having a circle equivalent diameter of from 0.6 to 2.0 .mu.m in an amount not greater than 5% by quantity, toner particles having a particle diameter of from 3.17 to 4.00 .mu.m in an amount of from 10 to 40% by quantity, toner particles having a diameter of from 4.00 to 5.04 .mu.m in an amount of from 20 to 40% by quantity, and toner particles having a diameter not less than 12.7 .mu.m in an amount of from 0 to 1.0% by weight. The toner satisfies the following relationship: 1.04.ltoreq.D4/D1.ltoreq.1.30, wherein D4 represents the weight average particle diameter and D1 represents a number average particle diameter of the toner.