A composition for forming an organic film, comprising: a polymer having a partial structure shown by the following general formula as a repeating unit; and an organic solvent, wherein each of AR1 and AR2 represents a benzene ring or a naphthalene ring which optionally have a substituent; W 1 represents any shown by the following general formulae , , and , and the polymer optionally contains two or more kinds of W 1 ; and wherein the divalent organic group represented by W 2 in the general formula is any of the following, wherein AR3, AR4, and AR5 each represent a benzene ring or a naphthalene ring which optionally have a substituent, and aromatic rings of AR3 and AR4, or AR4 and AR5, optionally form a bridge structure via carbon atoms to which hydrogen atoms have been bonded on the aromatic ring; and Y represents a substituent shown by the following general formula , wherein R 3 represents a single bond or a divalent organic group having 20 or fewer carbon atoms; and R 4 represents hydrogen or a monovalent organic group having 20 or fewer carbon atoms, wherein AR 6 and AR 7 each represent a benzene ring or a naphthalene ring which optionally have a substituent; n1 represents 0 or 1, when n1=0, AR 6 and AR 7 form no bridge structure between aromatic rings thereof via Z, and when ni=1, AR 6 and AR 7 form a bridge structure via Z; Z represents a single bond or any in the following general formula ; and Y represents a substituent shown by the general formula , wherein AR 8 represents a benzene ring, a naphthalene ring, an anthracene ring, a phenanthrene ring, or a pyrene ring; Y represents a substituent shown by the general formula ; and n2 and n3 represent integers satisfying relations of 0≤n2≤4, 0≤n3≤4, and 1≤n2+n3≤4. a polymer having a partial structure shown by the following general formula as a repeating unit; and an organic solvent, wherein each of AR1 and AR2 represents a benzene ring or a naphthalene ring which optionally have a substituent; W 1 represents any shown by the following general formulae , , and , and the polymer optionally contains two or more kinds of W 1 ; and wherein the divalent organic group represented by W 2 in the general formula is any of the following, wherein AR3, AR4, and AR5 each represent a benzene ring or a naphthalene ring which optionally have a substituent, and aromatic rings of AR3 and AR4, or AR4 and AR5, optionally form a bridge structure via carbon atoms to which hydrogen atoms have been bonded on the aromatic ring; and Y represents a substituent shown by the following general formula , wherein R 3 represents a single bond or a divalent organic group having 20 or fewer carbon atoms; and R 4 represents hydrogen or a monovalent organic group having 20 or fewer carbon atoms, wherein AR 6 and AR 7 each represent a benzene ring or a naphthalene ring which optionally have a substituent; n1 represents 0 or 1, when n1=0, AR 6 and AR 7 form no bridge structure between aromatic rings thereof via Z, and when ni=1, AR 6 and AR 7 form a bridge structure via Z; Z represents a single bond or any in the following general formula ; and Y represents a substituent shown by the general formula , wherein AR 8 represents a benzene ring, a naphthalene ring, an anthracene ring, a phenanthrene ring, or a pyrene ring; Y represents a substituent shown by the general formula ; and n2 and n3 represent integers satisfying relations of 0≤n2≤4, 0≤n3≤4, and 1≤n2+n3≤4. <EOS>