Provided is a fibrous carbon nanostructure that is easy to surface modify. A peak of a temperature derivative curve that is a first derivative curve of a thermogravimetric curve obtained by thermogravimetric analysis of the fibrous carbon nanostructure in a dry air atmosphere has a full width at half maximum of not less than 38° C. and less than 90° C., and a high-temperature-side temperature at a height equivalent to 1/10 of the peak top height of the peak is 658° C. or higher.
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