The present invention provides a medical device comprising a main body that is an artificial prosthetic member, and a metallic porous thin plate deformed to follow at least a part of a surface shape of the main body and joined thereto. The metallic porous thin plate is prepared by: molding a slurry containing a metal powder, a foaming agent, a water-soluble resin binder, and water into a sheet shape； subjecting the slurry to a foaming process； drying the slurry； and defatting and sintering the resulting compact. An average grain diameter of the metal powder is in the range of 0.5 to 50 µm, a content of the metal powder in the slurry is in the range of 30 to 80 mass%, an average pore diameter of the metallic porous thin plate is in the range of 20 to 800 µm, the metallic porous thin plate has a three-dimensional net-like cell structure, in which a skeleton of the metallic porous thin plate is formed from the metal powder, and a surface shape of a rear surface between the metallic porous thin plate and the main body is asymmetric with respect to a surface shape of a front surface between the metallic porous thin plate and the living tissue.
