A thermally conductive sheet having good thermal conductivity in the thickness direction and a method for producing a thermally conductive sheet. A thermally conductive sheet having a surface with an L* value in a L*a*b color system of 29 or more and 47 or less is obtained by preparing a thermally conductive composition comprising a curable resin composition, thermally conductive fibers, and thermally conductive particles, extrusion-molding the thermally conductive composition to obtain a columnar cured product, and cutting the columnar cured product in a direction almost perpendicular to a length direction of a column to a predetermined thickness.