The present invention provides to a composition, a composition for coloring and a conductive composition, each of which contains new carbon black having a specific number average particle size of Feret's diameter. The present invention relates to a composition containing carbon black, in which a number average particle size of Feret's diameter is 5 to 300 nm and primary particles are contained at 5% or more on a number basis. The composition of the present invention is uniform in coloring and conductivity and makes it possible to be uniform in coloring and conductivity of final forms using those compositions.