Re-releasable adhesive agent and re-releasable adhesive sheet

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A re-releasable adhesive agent comprises a radiation-reactive polymer and a radiation polymerization initiator, the radiation-reactive polymer has a side chain derived from at least one monomer expressed by the formula (1) : CH2=CR1COOR2 (1), where R1 is a hydrogen atom or a methyl group, and R2 is a C6 or higher alkyl group, and a side chain having one carbon-carbon double bond, and the monomer of formula (1) is contained in a ratio of less than 50 mol% with respect to the total monomer constituting the main chain of the radiation-reactive polymer.