An object of the present invention is to provide an addition-curable silicone resin composition excellent in interfacial adhesion, storage stability, and transparency. Moreover, an object of this invention is to provide the addition curable silicone resin hardened | cured material and optical semiconductor element sealing body which use this addition curable silicone resin composition. The present invention is an addition curable silicone resin composition comprising an addition curable silicone resin mixture and an adhesion promoter, wherein the addition curable silicone resin mixture has a refractive index of 1.35 to 1.45. And the adhesion-imparting agent is represented by the following formula (1-3) between the structural unit represented by the following formula (1-1) and the structural unit represented by the following formula (1-2). An addition-curable silicone resin composition comprising a structural unit represented by formula (1-4) below and / or a compound having a refractive index of 1.35 to 1.45. . In Formula (1-1) and Formula (1-2), R 1a independently represents an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group, an aryl group, or an aralkyl group. In formula (1-3) and formula (1-4), R 1b independently represents an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group, an aryl group, or an aralkyl group. In formula (1-3), m is an integer of 1-50, and in formula (1-4), n is an integer of 1-1500. In formulas (1-1) to (1-3), each A is independently represented by an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group, an aryl group, an aralkyl group, or the following formula (2). It is a group. However, in formulas (1-1) to (1-3), at least one A is a group represented by formula (2). In formula (2), R2a represents a C1-C8 alkylene group in which some of the carbon atoms excluding the carbon atom bonded to the silicon atom may be substituted with an oxygen atom, and R2b each independently Represents an alkylene group having 1 to 3 carbon atoms, R 3 independently represents an alkylene group having 1 to 3 carbon atoms, and R 4 each independently represents a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, OH Represents a C 1-3 alkyl group having a group or a halogeno group. In formula (2), x is an integer of 0-2. [Chemical 1] [Chemical 2]
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