Provided is an elastomer which is suitable for application in actuators or sensors, and which exhibits an appropriately low initial elastic modulus in a low deformation region.
An elastomer composition containing the following components (A) to (D):
component (A): a polyrotaxane;
component (B): a crosslinking agent containing a second linear molecule having a molecular weight of 1,200 to 7,000, and a functional group disposed at both ends of the second linear molecule;
component (C): a double-reactive component having a reactive group at both ends; and
component (D): a single-reactive component having a reactive group at only one end, wherein at least a portion of the functional group in the component (B) is directly or indirectly bonded to the cyclic molecule in the component (A), and the elastomer composition exhibits an initial elastic modulus of 0.6 to 2 MPa.