The present invention provides a liquid-crystalline elastomer having large generation force and a large amount of displacement. The liquid-crystalline elastomer according to the present invention is composed of a polymer of liquid-crystalline molecular units and cross-linking reagent units. Each of the cross-linking reagent units contains a bicyclo structure selected from the group consisting of a bicyclo [2,2,1] heptane structure or a bicyclo [2,2,2] octane structure. A molar ratio of the cross-linking reagents to the liquid-crystalline molecular units is not less than 0.1 and not more than 0.2. The bicyclo [2,2,1] heptane structure may be a trycyclodecane structure. The bicyclo [2,2,2] octane structure may be a trycycloundecane structure.