An addition reaction-curable silicone adhesive composition for skin application, comprising the following components (X), (C), and (D): (X) 100 parts by mass of a mixture of the following component (A) with the following component (B), or a condensation reaction product between the following component (A) and the following component (B), (A) 55 to 90 parts by mass of a diorganopolysiloxane consisting of the following components (A1) and (A2), wherein a mass ratio of (A1)/(A2) is within a range from 90/10 to 15/85, (A1) a diorganopolysiloxane having two or more alkenyl groups per molecule and an alkenyl group-content of at least 0.0005 mol/100 g and less than 0.15 mol/100 g, and wherein the molecular chain terminals are not completely blocked in that some SiOH groups are left remaining, and (A2) a diorganopolysiloxane having a SiOH group at a terminal and no alkenyl group, and (B) 10 to 45 parts by mass of an organopolysiloxane, provided that a total of the components (A) and (B) is 100 parts by mass, wherein the organopolysiloxane contains an R 1 3 SiO 0.5 unit, a SiOz unit, and a siloxane unit having a silicon atom-bonded hydroxyl group and/or a siloxane unit having a silicon atom-bonded alkoxy group with 1 to 6 carbon atoms, each R 1 independently represents a monovalent hydrocarbon group having 1 to 10 carbon atoms, and a molar ratio of the R 1 3 SiO 0.5 unit/the SiOz unit is 0.5 to 1.5; (C) an organohydrogenpolysiloxane containing three or more SiH groups per molecule, wherein the organohydrogenpolysiloxane is in such an amount that a molar ratio of the SiH groups in the component (C) to the alkenyl groups in the component (A) is 0.2 to 15; and (D) a platinum group metal-based catalyst in an amount of 1 to 5,000 ppm in terms of platinum group metal relative to the total amount of the components (A) and (B) based on mass. (A) 55 to 90 parts by mass of a diorganopolysiloxane consisting of the following components (A1) and (A2), wherein a mass ratio of (A1)/(A2) is within a range from 90/10 to 15/85, (A1) a diorganopolysiloxane having two or more alkenyl groups per molecule and an alkenyl group-content of at least 0.0005 mol/100 g and less than 0.15 mol/100 g, and wherein the molecular chain terminals are not completely blocked in that some SiOH groups are left remaining, and (A2) a diorganopolysiloxane having a SiOH group at a terminal and no alkenyl group, and (A1) a diorganopolysiloxane having two or more alkenyl groups per molecule and an alkenyl group-content of at least 0.0005 mol/100 g and less than 0.15 mol/100 g, and wherein the molecular chain terminals are not completely blocked in that some SiOH groups are left remaining, and (A2) a diorganopolysiloxane having a SiOH group at a terminal and no alkenyl group, and (B) 10 to 45 parts by mass of an organopolysiloxane, provided that a total of the components (A) and (B) is 100 parts by mass, wherein the organopolysiloxane contains an R 1 3 SiO 0.5 unit, a SiOz unit, and a siloxane unit having a silicon atom-bonded hydroxyl group and/or a siloxane unit having a silicon atom-bonded alkoxy group with 1 to 6 carbon atoms, each R 1 independently represents a monovalent hydrocarbon group having 1 to 10 carbon atoms, and a molar ratio of the R 1 3 SiO 0.5 unit/the SiOz unit is 0.5 to 1.5; (C) an organohydrogenpolysiloxane containing three or more SiH groups per molecule, wherein the organohydrogenpolysiloxane is in such an amount that a molar ratio of the SiH groups in the component (C) to the alkenyl groups in the component (A) is 0.2 to 15; and (D) a platinum group metal-based catalyst in an amount of 1 to 5,000 ppm in terms of platinum group metal relative to the total amount of the components (A) and (B) based on mass. <EOS>