Led sealant composition

[Problem] To provide: an LED sealant composition; a cured product obtained by curing said LED sealant composition; and an LED device having an LED element sealed with said cured product. [Solution] This LED sealant composition comprises (A) a linear organopolysiloxane that has at least two alkenyl groups bound to a silicon atom per molecule and that has three types of structural units represented by formula (1): (R 1 R 2 R 3 SiO 1/2 ) a (R 4 R 5 SiO 2/2 ) b (R 6 2 SiO 2/2 ) c , (B) a linear organopolysiloxane that has at least two hydrogen atoms bound to a silicon atom per molecule and that has three types of structural units represented by formula (2): (R 7 R 8 R 9 SiO 1/2 ) d (R 10 R 11 SiO 2/2 ) e (R 12 2 SiO 2/2 ) f , and (C) a hydrosilylation catalyst, wherein R 4 in formula (1) and/or R 10 in formula (2) represents a biphenylyl group.