Recently developed substrateless continuous SiC filament is expected to be a new reinforcing filament for composite materials. In order to apply this filament to fiber reinforced metals, strength properties at both room and elevated temperatures were examined. Room temperature tensile strength showed no strain rate dependence, while it showed gauge length dependence to the similar degree as those of chemical-vapor-deposited SiC filaments. In-air tensile strength at elevated temperatures was in the range of reported data for chemical-vapor-deposited tungsten-substrate filaments. Significant improvement in room temperature tensile strength by acid treatments was not observed.