Photoresponsive polymer

A photoresponsive polymer comprising a structural unit represented by the following general formula (2), fluidized by light irradiation, and reversibly non-fluidized:

• wherein,
• r1 represents a hydrogen atom or a methyl group, and
• A is represented by any one of the following general formulas (1-1) to (1-4):
• *—R1—Z1═Z2—R2 General formula (1-1)
• *-G-R1—Z1═Z2—R2 General formula (1-2)
• *—R2—Z2═Z1—R1 General formula (1-3)
• *-G-R2—Z2═Z1—R1 General formula (1-4)
• in which
• * represents a bonding point, G represents a divalent group, and Z1 and Z2 each represent CH or N,
• Z1≠Z2,
• R1 represents an aromatic hydrocarbon group having a substituent Ra selected from the group consisting of an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, and a fluorine atom, at each of two ortho positions with respect to Z1, and
• R2 represents a 5-member aromatic heterocyclic ring or a fused indole ring, with or without a substituent that is an alkyl group having 1 to 12 carbon atoms.