Titanium-based porous body and method of producing the same

A sheet-like titanium-based porous body having a specific surface area of 4.5×10−2 to 1.5×10−1 m2/g, a void fraction of 55 to 70%, a thickness of 4.0×10−1 to 1.6 mm, a surface roughness of at least one surface of 8.0 μm or less, and conductivity 2020 S/cm or more and 3550 S/cm or less determined according to JIS K 7194,

• wherein the specific surface area is measured by a BET method according to JIS Z 8831:2013,
• wherein the surface roughness is the arithmetic mean roughness Ra determined according to JIS B 0601-2001, and
• wherein the void fraction is a pore ratio per unit volume of the sheet-like titanium-based porous body in percentage and calculated according to a following formula (A) based on a volume V (cm3) of the sheet-like titanium-based porous body, a mass M (g) of the sheet-like titanium-based porous body, and a true density D (g/cm3) of the sheet-like titanium-based material:
• Void fraction (%)=(1−(M/V)/D)×100 (A).