Flat plate-shaped porous carbon material, method for producing flat plate-shaped porous carbon material, and precursor

The flat plate-shaped porous carbon material comprises a first main surface and a second main surface opposite to the first main surface, and satisfies all of conditions (1) to (5). (1): Pores having a pore diameter of 2 nm to 50 nm are provided in the vicinity of the surface at the first main surface and/or the second main surface, and, in a cross-sectional view in the thickness direction, the pores are present in the range to 20 [mu]m in the thickness direction from the surface of the main surface on the side where the pores are provided. (2): A diffraction peak (G) originating with the (002) graphite crystal plane is present as a diffraction peak obtained by wide-angle X-ray diffraction measurement. (3): A diffraction peak (S) originating with the silicon carbide crystal is present as a diffraction peak obtained by wide-angle X-ray diffraction measurement. (4): The BET specific surface area is 5 m2/g to 50 m2/g. (5): The BJH pore diameter distribution has a peak in the range of 2 nm to 50 nm.