Anisotropic conductive film and connection structure

An anisotropic conductive film having a first electrically conductive particle group-containing layer containing a first electrically conductive particle group and a second electrically conductive particle group-containing layer containing a second electrically conductive particle group, each group comprising a plurality of electrically conductive particles, in an insulating binder;

• wherein the first electrically conductive particle group and the second electrically conductive particle group are present in a first region that is in the first electrically conductive particle group-containing layer and a second region that is in the second electrically conductive particle group-containing layer, respectively, which differ from each other in a thickness direction of the anisotropic conductive film and are parallel to a plane direction;
• the second electrically conductive particle group-containing layer is laminated on the first electrically conductive particle group-containing layer,
• the insulating binder of each of the first and second electrically conductive particle group-containing layers contains a polymerizable composition,
• the first electrically conductive particle group and the second electrically conductive particle group differ from each other in an existence state of the electrically conductive particles,
• the respective electrically conductive particles constituting the second electrically conductive particle group exist being dispersed in the second region, and
• the respective electrically conductive particles constituting the first electrically conductive particle group are arranged regularly wherein the respective electrically conductive particles constituting the first electrically conductive particle group are arranged regularly in a lattice form, the respective electrically conductive particles constituting the first electrically conductive particle group have a number density in the range of from 10000 to 30000 particles/mm2, the respective electrically conductive particles constituting the second electrically conductive particle group are randomly dispersed in the second region, and the respective electrically conductive particles constituting the second electrically conductive particle group have a number density in the range of from 2000 to 10000 particles/mm2.