Optical adhesive sheet

This adhesive sheet (10) contains a base polymer as a photopolymer and is photocurable. This adhesive sheet (10) has a gel fraction of at least 75% by mass after curing by a photocuring process under the condition of an irradiation integrated light quantity of 3000 mJ/cm2. The adhesive sheet (10) has an adhesive strength of 2.5 N/10 mm or higher in a peeling test for peeling the adhesive sheet (10) from an alkaline glass plate under the condition of 85 DEG C, a peeling angle of 180 DEG, and a tensile speed of 300 mm/minute, the peeling test being performed after: performing a photocuring process having a condition in which the irradiation integrated light quantity is 3000 mJ/cm2 with respect to the adhesive sheet (10); bonding the adhesive sheet (10) to the alkaline glass sheet, which is fabricated by a float method; and heating and pressurizing the adhesive sheet (10) which is on the alkaline glass sheet, under the condition of 50 DEG C, 0.5 MPa and for 15 minutes.