To provide a double-sided adhesive tape which is good in adhesion to a subject even when it is thin, and is excellent in water-proofing performance. The double-sided adhesive tape comprises a foamed base material and an adhesive layer, wherein the foamed base material has a 25% compression strength of 40-160 kPa and a tensile strength of 300-1,500 N/cm2.The foamed base material is used so that solid bodies can be stuck to each other to give excellent fastness between the double-sided adhesive tape and a subject, and a water-proofing double-sided adhesive tape can be realized to prevent effectively water from invading.