A silicon resin composition comprising: a silicon resin mixture; and a silicon compound, the silicon resin mixture containing (A-i) polyorganosiloxane that has at least two substituents each having a carbon-carbon double bond bonded to a silicon atom, (A-ii) polyorganohydrogen siloxane having at least two hydrogen groups each bonded to a silicon atom, and (A-iii) a hydrosilylation catalyst, the amount of the component being 0.01 to 20 parts by mass based on 100 parts by mass of the total of the components (A-i), (A-ii), and (A-iii), the silicone compound having a structural unit represented by Formula and a structural unit represented by Formula between a structural unit represented by Formula and a structural unit represented by Formula: in Formula and Formula, R 1a s each independently representing a C1-C18 hydrocarbon group selected from an alkyl group, a cycloalkyl group, an aryl group, and an aralkyl group, in Formula and Formula, R 1b s each independently representing a C1-C18 hydrocarbon group selected from an alkyl group, a cycloalkyl group, an aryl group, and an aralkyl group, in Formula, R 2a representing a C1-C8 alkylene group in which a part of carbon atoms, except for the carbon atom bonded to a silicon atom, is optionally substituted with an oxygen atom, R 2b representing a C1-C3 alkylene group, R 3 representing a C1-C3 alkylene group, R 4 representing a hydrogen atom, a C1-C3 alkyl group, a C1-C3 alkyl group having an OH group, or a halogeno group, in Formula, m representing an integer of 1 to 50, x representing an integer of 0 to 2, and in Formula, n representing an integer of 10 to 1500. a silicon resin mixture; and a silicon compound, the silicon resin mixture containing (A-i) polyorganosiloxane that has at least two substituents each having a carbon-carbon double bond bonded to a silicon atom, (A-ii) polyorganohydrogen siloxane having at least two hydrogen groups each bonded to a silicon atom, and (A-iii) a hydrosilylation catalyst, the amount of the component being 0.01 to 20 parts by mass based on 100 parts by mass of the total of the components (A-i), (A-ii), and (A-iii), the silicone compound having a structural unit represented by Formula and a structural unit represented by Formula between a structural unit represented by Formula and a structural unit represented by Formula: in Formula and Formula, R 1a s each independently representing a C1-C18 hydrocarbon group selected from an alkyl group, a cycloalkyl group, an aryl group, and an aralkyl group, in Formula and Formula, R 1b s each independently representing a C1-C18 hydrocarbon group selected from an alkyl group, a cycloalkyl group, an aryl group, and an aralkyl group, in Formula, R 2a representing a C1-C8 alkylene group in which a part of carbon atoms, except for the carbon atom bonded to a silicon atom, is optionally substituted with an oxygen atom, R 2b representing a C1-C3 alkylene group, R 3 representing a C1-C3 alkylene group, R 4 representing a hydrogen atom, a C1-C3 alkyl group, a C1-C3 alkyl group having an OH group, or a halogeno group, in Formula, m representing an integer of 1 to 50, x representing an integer of 0 to 2, and in Formula, n representing an integer of 10 to 1500.