Use of an indication label for pharmaceutical products or foods, wherein the indication label comprises: (i) a pressure sensitive adhesive sheet comprising: a barrier base material having gas barrier properties to water vapor and oxygen; a pressure sensitive adhesive layer laminated on a surface of the barrier base material; a print-receiving layer provided on a surface of the barrier base material opposite to the pressure sensitive adhesive layer, and (ii) a printing layer laminated on a surface of the pressure sensitive adhesive sheet opposite to the pressure sensitive adhesive layer; wherein the pressure sensitive adhesive layer comprises an extruded product of a pressure sensitive adhesive composition that contains a thermoplastic elastomer; when the barrier base material has a thickness of 50 μm, the barrier base material has a water vapor transmission rate of 15 g·m 2 ·day -1 or less, measured according to Exemplary Test 1 in the description when the barrier base material has a thickness of 50 μm, the barrier base material has an oxygen transmission rate of 10 cc·m -2 ·day -1 ·atm -1 or less, measured according to Exemplary Test 2 in the description the barrier base material comprises one or more base materials and one or more barrier layers laminated on a surface of the base materials; a material which constitutes the one or more base materials is a resin-based material; and a material which constitutes the one or more barrier layers is selected from one or more of aluminum, magnesium, zinc and tin. (i) a pressure sensitive adhesive sheet comprising: a barrier base material having gas barrier properties to water vapor and oxygen; a pressure sensitive adhesive layer laminated on a surface of the barrier base material; a print-receiving layer provided on a surface of the barrier base material opposite to the pressure sensitive adhesive layer, and a barrier base material having gas barrier properties to water vapor and oxygen; a pressure sensitive adhesive layer laminated on a surface of the barrier base material; a print-receiving layer provided on a surface of the barrier base material opposite to the pressure sensitive adhesive layer, and (ii) a printing layer laminated on a surface of the pressure sensitive adhesive sheet opposite to the pressure sensitive adhesive layer; the pressure sensitive adhesive layer comprises an extruded product of a pressure sensitive adhesive composition that contains a thermoplastic elastomer; when the barrier base material has a thickness of 50 μm, the barrier base material has a water vapor transmission rate of 15 g·m 2 ·day -1 or less, measured according to Exemplary Test 1 in the description when the barrier base material has a thickness of 50 μm, the barrier base material has an oxygen transmission rate of 10 cc·m -2 ·day -1 ·atm -1 or less, measured according to Exemplary Test 2 in the description the barrier base material comprises one or more base materials and one or more barrier layers laminated on a surface of the base materials; a material which constitutes the one or more base materials is a resin-based material; and a material which constitutes the one or more barrier layers is selected from one or more of aluminum, magnesium, zinc and tin.