Provided is a combined oil ring in which carbon sludge is not deposited between side rails and a spacer expander even if an internal combustion engine is operated for a long period of time. The combined oil ring includes: a pair of upper and lower plate-like circular side rails; and a spacer expander arranged between the pair of upper and lower side rails. The spacer expander includes: a large number of upper pieces and lower pieces that are alternately arranged in a circumferential direction so as to be spaced apart in an axial direction and the circumferential direction; coupling pieces that respectively couple the adjacent upper pieces and lower pieces; and ear parts that are each formed so as to erect in an inner circumferential end portion of each of the upper pieces and the lower pieces, and serve to push the side rails. At least one of an upper surface of each upper piece and a lower surface of each lower piece has a groove formed thereon. Each ear part has, formed therein, a through-hole with which the groove is communicated. The through-hole is formed such that a distance along the axial direction between one of an upper surface and a lower surface of each ear part at a top thereof and a deepest portion of the groove is equal to or more than 0.22 mm.