Carbon powder for catalyst, catalyst using said carbon powder for catalyst, electrode catalyst layer, membrane electrode assembly, and fuel cell

The present invention provides a carbon powder, which can provide a catalyst with superior durability, and a catalyst. This carbon powder for a catalyst has carbon as the principal component and is characterized in that the BET specific surface area per unit weight is 900 m 2 /g or greater, and a ratio R' (D'/G intensity ratio) of the peak intensity (D' intensity) for the D' band measured in the vicinity of 1620 cm -1 to a peak intensity (G intensity) for the G band measured in the vicinity of 1580 cm -1 by Raman spectrometry is 0.6 or less.