A cathode material for a lithium-ion secondary battery which is made of agglomerated secondary particles formed by agglomeration of a plurality of primary particles of electrode active material particles made of a transition metal lithium phosphate compound having an olivine structure that is coated with a carbonaceous material, in which an arithmetic average roughness Ra of agglomerated secondary particle surfaces observed using a three-dimensional scanning electron microscope is 15 nm or more and 25 nm or less.