A conjugate in which a deferoxamine-type compound and a biocompatible polymer are conjugated, wherein the deferoxamine-type compound is at least one compound selected from the group consisting of deferoxamine or an ion or salt thereof, wherein the biocompatible polymer contains a first biocompatible polymer chain and a second biocompatible polymer chain that is different from the first biocompatible polymer chain, wherein the conjugate includes a structure represented by General Formula: A-L-B (in Formula, A represents the first biocompatible polymer chain; L represents a linker part; and B represents the second biocompatible polymer chain), and wherein the conjugate includes a structure represented by General Formula: (in Formula, l is an integer of 1 to 1,500, B represents the second biocompatible polymer chain and includes a repeating structure represented by the following (b2-1), or a repeating structure represented by (b 1-1) and a repeating structure represented by (b2-1)), (in Formulae (b1-1) and (b2-1), R 11 represents an amino acid side chain; R 12 is a group obtained by conjugating a carboxyl group in an aspartic acid side chain represented by -CH 2 -COOH or a carboxyl group in a glutamic acid side chain represented by -CH 2 -CH 2 -COOH to the deferoxamine-type compound; and n 1 represents the total number of (b1-1) and (b2-1), n 1 is an integer of 1 to 1,000, mi is an integer of 1 to 1,000 (here, mi ≤ m), in a case where n 1 - mi is 2 or more, a plurality of R 11 's may be the same as or different from each other, and in a case where mi is 2 or more, a plurality of R 12 's may be the same as or different from each other). A conjugate in which a deferoxamine-type compound and a biocompatible polymer are conjugated, wherein the deferoxamine-type compound is at least one compound selected from the group consisting of deferoxamine or an ion or salt thereof, wherein the biocompatible polymer contains a first biocompatible polymer chain and a second biocompatible polymer chain that is different from the first biocompatible polymer chain, wherein the conjugate includes a structure represented by General Formula: A-L-B (in Formula, A represents the first biocompatible polymer chain; L represents a linker part; and B represents the second biocompatible polymer chain), and wherein the conjugate includes a structure represented by General Formula: (in Formula, l is an integer of 1 to 1,500, B represents the second biocompatible polymer chain and includes a repeating structure represented by the following (b2-1), or a repeating structure represented by (b 1-1) and a repeating structure represented by (b2-1)), (in Formulae (b1-1) and (b2-1), R 11 represents an amino acid side chain; R 12 is a group obtained by conjugating a carboxyl group in an aspartic acid side chain represented by -CH 2 -COOH or a carboxyl group in a glutamic acid side chain represented by -CH 2 -CH 2 -COOH to the deferoxamine-type compound; and n 1 represents the total number of (b1-1) and (b2-1), n 1 is an integer of 1 to 1,000, mi is an integer of 1 to 1,000 (here, mi ≤ m), in a case where n 1 - mi is 2 or more, a plurality of R 11 's may be the same as or different from each other, and in a case where mi is 2 or more, a plurality of R 12 's may be the same as or different from each other).