There are provided an air-conditioner working fluid for electric vehicle providing sufficient cycle performance in practical use in an electric vehicle, in particular, sufficient cycle performance also in the heating time, while suppressing influence on global warming, and usable without greatly changing an air-conditioner device for a conventional working fluid, for example, HFC-134a or HFO-1234yf, and an air-conditioner working fluid composition for electric vehicle containing the same. The air-conditioner working fluid for electric vehicle contains trifluoroethylene, difluoromethane and 1,3,3,3-tetrafluoropropene, wherein a percentage of a total amount of trifluoroethylene, difluoromethane and 1,3,3,3-tetrafluoropropene with respect to a total amount of the working fluid is more than 90 mass % and 100 mass % or less.