Patent ID: 7887899

Claim:
An anisotropic electroconductive sheet, having electrical conductivity in a direction of thickness; the sheet comprising a base film formed by using a porous film that is made of synthetic resin and that has an electrically insulating property; the porous film being provided with a plurality of holes that are formed in the direction of thickness so that pin electrodes can be through-hole-mounted; the holes having inner walls coated with metals; the though-hole-mounted pin electrodes become electrically continuous, through the metals, with the surface opposite to the surface from which the pin electrodes are to be inserted, wherein the porous film has a non-porous film that is made of synthetic resin and that has an electrically insulating property at a side from which the pin electrodes are to be though-hole-mounted; the non-porous film is provided with a plurality of holes that are formed in the direction of thickness so that the pin electrodes can be through-hole-mounted; the non-porous film has a surface roughness of at most 10 μm in arithmetic-mean roughness; and the thickness of the non-porous film is at least 10% and at most 60% of a total thickness of the porous film having the non-porous film.