A test socket is provided that includes a base material including an insulating elastic material and a conductive portion extending through the base material in a thickness direction of the base material, wherein the conductive portion includes a plurality of conductive particle structures arranged in the thickness direction of the base material, and each of the plurality of conductive particle structures includes a plurality of conductive particles having at least one insulating wire and/or at least one conductive wire extending from a surface of the conductive particle, bonded with a material having a functional group.