A toner has positive chargeability. Particles of the toner each include a toner mother particle and external additive particles adhering to a surface of the toner mother particle. The external additive particles include first external additive particles and second external additive particles. The first external additive particles have positive chargeability and are each a first silica particle having a surface treated with a positive chargeability imparting agent and a hydrophobing agent. The second external additive particles have negative chargeability and are each a second silica particle having a surface treated only with a silane compound. The silane compound is at least one alkylalkoxysilane represented by formula (I) shown below. In formula (I), R1 represents an alkyl group having a carbon number of at least 8 and no greater than 16. R2, R3, and R4 each represent, independently of one another, an optionally substituted hydrocarbon group.