Positively chargeable toner and two-component developer including positively chargeable toner

A positively chargeable toner comprising toner particles each including:

• a toner base particle containing, at least, a binder resin, a colorant, and a release agent;
• and an external additive attached to a surface of the toner base particle,
• wherein
• the external additive includes an inorganic particle and a resin particle,
• the resin particle contains a cationic surfactant, has a volume average particle size of 40 nm or more but 110 nm or less, and has a hardness of 1 μN or higher when measured with a probe displacement of 40 nm, and
• expressions (1) and (2) below are satisfied, where ΔSP1 is a difference between an SP value of the release agent and an SP value of the resin particle, and ΔSP2 is a difference between an SP value of the binder resin and the SP value of the resin particle:
• 0
• .
• 8
• ≦
• Δ
• ⁢
• SP
• ⁢
• 1
• ≦
• 1.1
• (
• cal
• /
• cm
• 3
• )
• 1
• /
• 2
• ;
• (
• 1
• )
• 1.3
• ≦
• Δ
• ⁢
• SP
• ⁢
• 2
• ≦
• 1.6
• (
• cal
• /
• cm
• 3
• )
• 1
• /
• 2
• .
• (
• 2
• )