Use of an easy peel coating composition for protecting a surface of a metallic instrument or part, wherein the easy peel coating composition is an organic solvent-based easy peel coating composition comprising: a polycarbonate resin having a structural unit represented by General formula: wherein, R 1 -R 4 each independently represent hydrogen, fluorine, chlorine, bromine, iodine, or an optionally substituted C1-C20 alkyl group, C6-C12 aryl group, C2-C12 alkenyl group, C1-C5 alkoxy group or C7-C17 aralkyl group; a represents an integer of 1-1,000; and X represents (wherein R 5 and R 6 each independently represent hydrogen, fluorine, chlorine, bromine, iodine, or an optionally substituted C1-C20 alkyl group, C1-C5 alkoxy group or C6-C12 aryl group, or R 5 and R 6 bind to each other to represent a group that forms a C5-C20 carbocyclic ring or a heterocyclic ring with an element number of 5-12; R 7 and R 8 each independently represent hydrogen, fluorine, chlorine, bromine, iodine, or an optionally substituted C1-C9 alkyl group, C1-C5 alkoxy group, C2-C12 alkenyl group or C6-C12 aryl group; R 9 represents an optionally substituted C1-C9 alkylene group; b represents an integer of 0-20; and c represents an integer of 1-500); and a non-halogen-based organic solvent,; and the content of the polycarbonate resin in the composition is 0.1-50 mass%, and the proportion of the structural unit represented by General formula below: in the structural unit represented by General formula is 0-80% in a molar ratio. a polycarbonate resin having a structural unit represented by General formula: wherein, R 1 -R 4 each independently represent hydrogen, fluorine, chlorine, bromine, iodine, or an optionally substituted C1-C20 alkyl group, C6-C12 aryl group, C2-C12 alkenyl group, C1-C5 alkoxy group or C7-C17 aralkyl group; a represents an integer of 1-1,000; and X represents (wherein R 5 and R 6 each independently represent hydrogen, fluorine, chlorine, bromine, iodine, or an optionally substituted C1-C20 alkyl group, C1-C5 alkoxy group or C6-C12 aryl group, or R 5 and R 6 bind to each other to represent a group that forms a C5-C20 carbocyclic ring or a heterocyclic ring with an element number of 5-12; R 7 and R 8 each independently represent hydrogen, fluorine, chlorine, bromine, iodine, or an optionally substituted C1-C9 alkyl group, C1-C5 alkoxy group, C2-C12 alkenyl group or C6-C12 aryl group; R 9 represents an optionally substituted C1-C9 alkylene group; b represents an integer of 0-20; and c represents an integer of 1-500); and a non-halogen-based organic solvent,; and the content of the polycarbonate resin in the composition is 0.1-50 mass%, and the proportion of the structural unit represented by General formula below: in the structural unit represented by General formula is 0-80% in a molar ratio. wherein, R 1 -R 4 each independently represent hydrogen, fluorine, chlorine, bromine, iodine, or an optionally substituted C1-C20 alkyl group, C6-C12 aryl group, C2-C12 alkenyl group, C1-C5 alkoxy group or C7-C17 aralkyl group; a represents an integer of 1-1,000; and X represents (wherein R 5 and R 6 each independently represent hydrogen, fluorine, chlorine, bromine, iodine, or an optionally substituted C1-C20 alkyl group, C1-C5 alkoxy group or C6-C12 aryl group, or R 5 and R 6 bind to each other to represent a group that forms a C5-C20 carbocyclic ring or a heterocyclic ring with an element number of 5-12; R 7 and R 8 each independently represent hydrogen, fluorine, chlorine, bromine, iodine, or an optionally substituted C1-C9 alkyl group, C1-C5 alkoxy group, C2-C12 alkenyl group or C6-C12 aryl group; R 9 represents an optionally substituted C1-C9 alkylene group; b represents an integer of 0-20; and c represents an integer of 1-500); and a non-halogen-based organic solvent,; and the content of the polycarbonate resin in the composition is 0.1-50 mass%, and the proportion of the structural unit represented by General formula below: in the structural unit represented by General formula is 0-80% in a molar ratio.