An aligned single-walled CNT aggregate which can readily be produced, whose specific surface are is high, whose individual carbon nanotubes (CNT) are aligned orderly, and whose bulk density is low whereby exhibiting a processability is provided. An aligned single-walled CNT aggregate should comprise a base material, fine particles of catalyst with a number density of 1 × 1010 to 5 × 1013N/cm2 disposed on this base material, and a plurality of single-walled CNTs which are grown from the fine particles of the catalyst, wherein the plurality of single-walled CNTs have a specific surface area of 600 m2/g to 2600 m2/g, and a weight density from 0.002 g/cm3 to 0.2 g/cm3, and the alignment degree is defined by specific conditions.
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