The present invention provides an oxidized LDL inhibitor that is capable of (i) binding specifically to oxidized LDL, (ii) suppressing the physiological activity of oxidized LDL, and (iii) inhibiting the uptake of oxidized LDL into cells. The oxidized LDL inhibitor according to the present invention contains a Del-1 protein as an active ingredient. The Del-1 protein consists, for example, of the amino acid sequence of SEQ ID NO: 1.