An object of the present invention is to provide a coating film that can be peeled in a sheet form, facilitates removal work and is less likely to be peeled even if used in an underwater structure for a long period of time, and an undercoat layer-forming composition for forming an undercoat layer of the coating film. The present invention relates to an undercoat layer-forming composition for forming an undercoat layer of a coating film including the undercoat layer and an antifouling layer which contains a silicone oil and is adhered to the undercoat layer, wherein the undercoat layer-forming composition contains a base polymer and a tackifying resin.
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