Toner

A toner comprising toner particles,

• wherein the toner particles contain a binder resin and a pigment, and
• when the toner is divided into two groups, a first group and a second group with an inertial classifier, the first group including a larger size of the toner particles, and the second group including a smaller size of the toner particles, and the number of the toner particles in the first group being substantially equal to the number of the toner particles in the second group, Al and As satisfy the following Expression (1),
• 1.5≤Al/As≤2.5 (1)
• wherein Al represents a change rate (%) of a surface potential of a pellet type molded product Pl made of the toner in the first group as measured by a following procedure:
• measurement of Al:
• molding 0.05 g of the toner in the first group under conditions of 20 kN to form the pellet type molded product Pl having a diameter of 10 mm;
• charging a surface of the pellet type molded product Pl to −600 V by a scorotron charger;
• after the charging, measuring a surface potential of the pellet type molded product Pl to obtain an initial surface potential;
• after the obtaining of the initial surface potential, leaving the pellet type molded product Pl under conditions of a temperature of 25° C. and a humidity of 50% for 1 hour;
• after the leaving, measuring the surface potential of the pellet type molded product Pl and calculating a changing rate of the surface potential with respect to the initial surface potential as the change rate (%), and
• As represents a change rate (%) of a surface potential of a pellet type molded product Ps made of the toner in the second group as measured by a following procedure:
• measurement of As:
• molding 0.05 g of the toner in the second group under conditions of 20 kN to form the pellet type molded product Ps having a diameter of 10 mm;
• charging a surface of the pellet type molded product Ps to −600 V by a scorotron charger;
• after the charging, measuring a surface potential of the pellet type molded product Ps to obtain an initial surface potential;
• after the obtaining of the initial surface potential, leaving the pellet type molded product Ps under conditions of a temperature of 25° C. and a humidity of 50% for 1 hour;
• after the leaving, measuring the surface potential of the pellet type molded product Ps and calculating a changing rate of the surface potential with respect to the initial surface potential as the change rate (%).