The present invention is R (CH _{3) 2} SiO _{/ 2} units of 80 to _98mol%, RSiO 3/2 units and from 0.1 to 10.0mol% R (CH _{3) 2} SiO _1/2 units of 0.1 to 10mol% to the containing organopolysiloxane (a) (wherein, R is methyl, phenyl, or alkenyl, provided that 0.25 to 4.0mol% of the organosilane of the R groups is alkenyl organopolysiloxane is Al), 100 parts by weight; Organopolysiloxane component (A) having an alkenyl group per Al 0.1 to 5 silicon-bonded hydrogen bonded to a sufficient amount of, on average at least two silicon atoms per molecule to provide the hydrogen atoms of (B); Platinum catalyst (C); Silica powder (D) 0.01 to 10 parts by weight; And one or more epoxy compounds, polyhydric alcohols and one or more thixotropic agent selected from a mixture thereof comprises (E) 0.01 to 5 parts by weight, the apparent viscosity ratio of 2.0 to 10.0, the curing 1/4 roughness is 10 to 200 of silicone gel It relates to a silicone gel composition that forms the. Silicone gel composition, an organopolysiloxane, a platinum catalyst, a silica powder, a thixotropic agent.