Adhesive sheet
Provided is an adhesive sheet that shows excellent adhesive strength to both high-polar and low-polar adherends with reduced dependence on fossil-resource-based materials. The PSA sheet has an adhesive layer formed from a natural rubber-based PSA. At least 20% by weight of all repeat units forming the base polymer of the PSA are derived from an acrylic monomer. Biomass-derived carbons account forat least 50% of the total carbon content of the adhesive layer. The adhesive sheet has an adhesive strength of 18 N/20 mm or greater to a stainless steel plate (after left at 50 DEG C for 2 h) and anadhesive strength of 15 N/20 mm or greater to a polypropylene plate (after left at 50 DEG C for 2 h).