SEAL DEVICE

Provided is a seal device configured so that seal properties can be held over a long period of time. A seal device 1 inserted into and disposed between grooves 51 each formed at first and second components 50A, 50B which are adjacent to each other and collectively form a housing structure includes a first seal member 2A inserted into the groove 51 of the first component 50A, a second seal member 2B inserted into the groove 51 of the second component 50B, and a partitioning member 3 extending between the first and second seal members 2A, 2B to partition a space between the grooves 51 of the first and second components 50A, 50B and arranged movably relative to the first and second seal members 2A, 2B.