Electrostatically charged image developing toner and electrostatically charged image developing two-component developer

An electrostatically charged image developing toner comprising a particulate toner matrix containing an external additive on the surface of the particulate toner matrix, wherein

• the external additive comprises silica particles A and silica particles B,
• the silica particles A have a number average primary-particle diameter in the range of 40 to 100 nm and an average circularity in the range of 0.50 to 0.90, and are surface-modified with silicone oil, and
• the silica particles B have a number average primary-particle diameter of 36 nm or more and smaller than the number average primary-particle diameter of the silica particles A, and are surface-modified with alkylalkoxysilane having a structure represented by Formula (1) or silazane:
• R1—Si(OR2)3 Formula (1)
• where R1 represents a linear alkyl group having 1 or more and 10 or less carbon atoms and has an optional substituent;
• R2 represents a methyl or ethyl group.