NOVELTY - A conductive composition comprises a mixture (m1) of 50-70 parts by weight (pts. wt.) spherical graphite; 1-15 pts. wt. carbon black; and 15-40 pts. wt. binder resin. The binder resin includes thermosetting resin and elastomer, and an average particle diameter of the spherical graphite is 1-30 mu m.    USE - In a conductive composition sheet, a conductive substrate and a collector sheet which is used in a printed circuit board and a fuel cell (claimed).    ADVANTAGE - The electrical conductivity of the conductive composition is improved because of spherical graphite and carbon black. Before thermosetting resin is cured, the conductive composition sheet is flexible and adhesive because of elastomer. Thus, the conductive composition sheet can be easily attached to a desired member while the thermosetting resin is not cured. The thermosetting resin is cured, so that the conductive composition sheet can be easily fixed to the member. Thus, the handleability of the conductive composition sheet is improved.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a conductive composition sheet that is formed of the conductive composition;    (2) a conductive substrate comprising: a metal layer; and a layer that is formed on at least one surface of the metal layer and is made of the conductive composition, or the conductive composition sheet that is formed on at least one surface of the metal layer;    (3) a collector sheet comprising: a metal layer having a predetermined pattern; and the conductive composition sheet that is formed on at least one surface of the metal layer;    (4) a printed circuit board comprising: an insulating layer; a conductor layer that is formed on the insulating layer and has a predetermined pattern; and a cover layer that is formed so as to cover at least part of a surface of the conductor layer, where the cover layer includes the conductive composition sheet;    (5) a fuel cell comprising: the collector sheet or the printed circuit board; a cell element; and a casing that stores the collector sheet or the printed circuit board and cell element, where the collector sheet or the printed circuit board has an opening; and    (6) manufacturing the conductive composition using a mixture that includes spherical graphite, involving: producing 100 pts. wt. the mixture (m1); and heating the mixture (m1) to a temperature higher than the temperature at which the thermosetting resin is cured.