Metal Support for Electrochemical Element, Electrochemical Element, Electrochemical Module, Electrochemical Device, Energy System, Solid Oxide Fuel Cell, Solid Oxide Electrolytic Cell, and Method for Manufacturing Metal Support

A metal support for an electrochemical element has a plate shape as a whole, and is provided with a plurality of penetration spaces that pass through the metal support from a front face to a back face. The front face is a face to be provided with an electrode layer. A region of the front face provided with the penetration spaces is a hole region, and openings of the penetration spaces formed in the front face are front-side openings. An aperture ratio that is a ratio of the front-side openings to the hole region is 0.1% or more and 7.0% or less.