A decomposable polymer represented by General Formula (1): where X1 denotes a certain group; X2 denotes a certain group; R1 and R2 each independently denote a hydrogen atom, an alkyl group, an aromatic group, or an electron-withdrawing group; R3 and R4 each independently denote a hydrogen atom, an alkyl group, or an aromatic group, provide that R3, R4, or both are a hydrogen atom; R5 and R6 each independently denote a hydrogen atom, an alkyl group, or an aromatic group, provide that R5, R6, or both are a hydrogen atom; R7 and R8 each independently denote a hydrogen atom, an alkyl group, a halogen atom, or an aromatic group, provided that R7 and R8 may bond together to form a ring structure; R9 and R10 each independently denote a hydrogen atom, an alkyl group, or an aromatic group; n denotes a positive integer; and m denotes 0 or 1.