Abstract: Provided is a button attachment tool that can eliminate or reduce rotation of a cap relative to an attachment tool body. A button attachment tool comprises a metal attachment tool body and a synthetic resin cap to which the attachment tool body is coupled. The attachment tool body includes a cylindrical part and a flange part extending radially outward from one axial end of the cylindrical part. The flange part includes a plurality of notches recessed radially inward from a peripheral edge of the flange part. The cap includes a clamping part that is fastened to a radially outer portion of the flange part including the plurality of notches.

Abstract: Provided is a button attachment tool that can eliminate or reduce rotation of a cap relative to an attachment tool body. A button attachment tool comprises a metal attachment tool body and a synthetic resin cap to which the attachment tool body is coupled. The attachment tool body includes a cylindrical part and a flange part extending radially outward from one axial end of the cylindrical part. The flange part includes a plurality of notches recessed radially inward from a peripheral edge of the flange part. The cap includes a clamping part that is fastened to a radially outer portion of the flange part including the plurality of notches.

Abstract: An IC memory card has a connector that cannot warp during the manufacturing process even if the connector is long, such as a connector at one longer side of the IC memory card with an increased number of poles. The IC memory card has grooves in the surfaces of a flange portion of the connector body opposing a surface with which the connection with an external unit is established, the grooves being adjacent the connector body and extending lengthwise along all of the longer side of the IC memory card for preventing warping.