Optical adhesive sheet

Provided is an optical adhesive sheet suitable for use in flexible devices. The adhesive sheet 10 is an optical adhesive sheet containing a polymer component. The ratio of (meth) acrylic acid in all monomer components forming the polymer component is 0.1-10% by mass (inclusive). The pressure-sensitive adhesive sheet (10) has an indentation hardness of 0.1 MPa or less at 23 DEG C as measured by a nanoindentation method. The adhesive sheet (10) has an adhesive force of 8 N/25 mm or more under the conditions of a peeling angle of 180 DEG and a tensile speed of 300 mm/min after 5 hours elapsed at 80 DEG C from the adhesion to an acrylic glass plate. 提供适合于柔性设备用途的光学粘合片。粘合片10为包含聚合物成分的光学粘合片。形成聚合物成分的全部单体成分中的(甲基)丙烯酸的比例为0.1质量％以上且10质量％以下。针对粘合片10，利用纳米压痕法而测得的23℃下的压痕硬度为0.1MPa以下。粘合片10自粘贴于亚历克玻璃板起在80℃下经过5小时后，对于该亚历克玻璃板而言，在剥离角度为180°且拉伸速度为300mm/分钟的条件下具有8N/25mm以上的粘合力。