An adhesive sheet in which an intermediate layer containing methyl methacrylate-grafted natural rubber is provided on a substrate containing a vinyl chloride resin and a plasticizer, and an adhesive layer comprising an adhesive containing the plasticizer and a rubber component containing natural rubber and methyl methacrylate-grafted natural rubber is provided on the intermediate layer, wherein the plasticizer is selected from the group consisting of DINP (diisononyl phthalate), DHP (diheptyl phthalate), DOP (di-2-ethylhexyl phthalate), n-DOP (di-n-octyl phthalate), DIDP (diisodecyl phthalate), DOIP (di-2-ethylhexyl isophthalate), DOTP (di-2-ethylhexyl terephthalate), BBP (benzylbutyl phthalate), TOTM (tri-2-ethylhexyl trimellitate), DOA (di-2-ethylhexyl adipate), TCP (tricresyl phosphate), BOA (benzyloctyl adipate), adipic acid-propylene glycol-based polyesters, adipic acid-butylene glycol-based polyesters, phthalic acid-propylene glycol-based polyesters, DPCP (diphenylcresyl phosphate), diisodecyl adipate, epoxidized soybean oil, epoxidized linseed oil, and chlorinated paraffin, and wherein a degree of swelling of the rubber component with respect to the plasticizer is by a factor of 1.5 to 4.5 when the degree of swelling is measured by the method comprising the following steps: (a) adding 1 part by mass of adhesive obtained from the adhesive surface side of the adhesive sheet with respect to 100 parts by mass of ethanol, (b) stirring (a) for 2 hours with a stirrer at a rotation speed on 600 rotations/min at 50 °C ± 2 °C in a stopper-equipped Erlenmeyer flask, (c) cooling the stopper-equipped Erlenmeyer flask with ice water to 23 °C or lower, (d) filtering the entire amount of the sample through a 270-mesh wire screen, wherein the weight of the wire screen was pre-measured, (e) heating the insoluble part after filtration for 10 minutes at 150 °C to obtain the rubber component, (f) adding 100 g of the plasticizer to 1.00g of the rubber component, (g) stirring (f) for 2 hours with a stirrer at a rotation speed of 600 rotations/min at 50 °C ± 2 °C in a sealed stopper-equipped Erlenmeyer flask, (h) cooling the stopper-equipped Erlenmeyer flask with ice water to 23 °C or lower, (i) filtering the entire amount of the sample through a 270-mesh wire screen, wherein the weight of the wire screen was pre-measured (the weight of the wire screen before filtration is represented by W1 (g)), (j) measuring the weight of the wire screen after filtration (the weight of the wire screen after filtration is represented by W2 (g)), and (k) computing the degree of swelling of the rubber component with respect to the plasticizer by means of the expression: Degree of swelling: W2 − W1 / 1.00. (a) adding 1 part by mass of adhesive obtained from the adhesive surface side of the adhesive sheet with respect to 100 parts by mass of ethanol, (b) stirring (a) for 2 hours with a stirrer at a rotation speed on 600 rotations/min at 50 °C ± 2 °C in a stopper-equipped Erlenmeyer flask, (c) cooling the stopper-equipped Erlenmeyer flask with ice water to 23 °C or lower, (d) filtering the entire amount of the sample through a 270-mesh wire screen, wherein the weight of the wire screen was pre-measured, (e) heating the insoluble part after filtration for 10 minutes at 150 °C to obtain the rubber component, (f) adding 100 g of the plasticizer to 1.00g of the rubber component, (g) stirring (f) for 2 hours with a stirrer at a rotation speed of 600 rotations/min at 50 °C ± 2 °C in a sealed stopper-equipped Erlenmeyer flask, (h) cooling the stopper-equipped Erlenmeyer flask with ice water to 23 °C or lower, (i) filtering the entire amount of the sample through a 270-mesh wire screen, wherein the weight of the wire screen was pre-measured (the weight of the wire screen before filtration is represented by W1 (g)), (j) measuring the weight of the wire screen after filtration (the weight of the wire screen after filtration is represented by W2 (g)), and (k) computing the degree of swelling of the rubber component with respect to the plasticizer by means of the expression: Degree of swelling: W2 − W1 / 1.00.