Gas separation membrane, gas separation module, gas separation apparatus, and polyimide compound

A gas separation membrane comprising a gas separation layer containing a polyimide compound,

• wherein the polyimide compound includes a repeating unit represented by formula (I):
• in formula (I), R represents a group represented by any one of formulae (I-1) to (I-28), where in formulae (I-1) to (I-28), X1 to X3 each represent a single bond or a divalent linking group, L represents —CH═CH— or —CH2—, and R1 and R2 each represent a hydrogen atom or a substituent, and * represents a bonding site,
• in formula (I), L2 represents a group represented by any one of formulae (II-1) to (II-3):
• in formulae (II-1) to (II-3), A represents a group represented by any one of formulae (III-1) to (III-8), B represents unsubstituted methyl, unsubstituted ethyl, unsubstituted n-propyl, unsubstituted i-propyl, a fluorine-substituted alkyl group having 1 to 5 carbon atoms, a fluorine-substituted acyl group having 2 to 6 carbon atoms, or a halogen atom, and * represents a bonding site, wherein at least one A is the group represented by formula (III-4), the group represented by formula (III-5), the group represented by formula (III-6), the group represented by formula (III-7) or the group represented by formula (III-8),
• α and β in formula (II-1) are integers satisfying (a), and α1, β1, α2, and β2 in formulae (II-2) and (II-3) are integers satisfying (b),
• 1≤α≤4,0≤β≤3,2≤α+β≤4 (a)
• 1≤α1+α2≤8,0≤1+β2≤7,2≤α1+α2+β1+β2≤8 (b)
• Ra and Rb in formula (II-2) each represent a hydrogen atom, unsubstituted methyl, unsubstituted ethyl, unsubstituted n-propyl, unsubstituted i-propyl, or a fluorine-substituted alkyl group having 1 to 5 carbon atoms, and
• in formulae (III-1) to (III-8), * represents a bonding site.