A sealing material composition for LED has excellent heat-resistant transparency, adhesion, and crack resistance, and low sulfur gas permeability. A sealing material composition for LED has the following (A), (B), (C), and (D):(A): polysiloxane containing units (1-1), (1-2), and (1-3): wherein R1 is C1-12 alkyl or C6-20 aryl, R2 is hydrogen, C1-12 alkyl, or Si constituting main chain of polysiloxane as (A); (B): polysiloxane containing units (2-1), (2-2), and (2-3): wherein R3 and R4 are each hydrogen, C1-12 alkyl, or Si constituting main chain of polysiloxane as (B); (C): adhesive; and (D): condensation catalyst for silanol group.