Adhesive layer, adhesive sheet, and optical member

The present invention relates to an adhesive layer, an adhesive sheet, and an optical member, the adhesive layer being formed from an adhesive composition containing a cross-linking agent and a (meth) acrylic polymer containing a structural unit derived from a (meth) acrylic monomer having a hydroxyl group and having a ratio (Mz + 1/Mw) of a z + 1 average molecular weight (Mz + 1) to a weight-average molecular weight (Mw) of 5.5 or more; the adhesive force measured under condition A is 4.0 N/25 mm or more, and the adhesive force measured under condition B is 0.05 N/25 mm to 2.0 N/25 mm (in an atmosphere temperature of 23 DEG C and 50% RH, an adhesive layer having a thickness of 15 [mu] m adhered to the PET film is peeled from the PET film under conditions of a peeling angle (condition A: 45 DEG C, condition B: 180 DEG C) and a peeling speed of 300 mm/min). 本发明涉及一种粘合剂层、粘合片和光学构件，所述粘合剂层由粘合剂组合物形成，所述粘合剂组合物包含：含有来自具有羟基的(甲基)丙烯酸系单体的结构单元且z+1平均分子量(Mz+1)与重均分子量(Mw)之比(Mz+1/Mw)为5.5以上的(甲基)丙烯酸系聚合物、以及交联剂；以条件A测定的粘合力为4.0N/25mm以上