Patent ID: 7420383

Claim:
An inspection unit, comprising: an insulative block, having a first face adapted to oppose a board on which an inspection circuit is arranged and a second face adapted to oppose a device to be inspected, the insulative block being formed with first through holes each of which communicates the first face and the second face; a conductive first plating layer, formed on the first face, the second face, and an inner face of at least one of the first through holes; and a plurality of contact probes, each of which comprises a conductive tubular body held in an associated one of the first through holes and a plunger which is retractably projected from one end of the tubular body and is adapted to come in contact with a terminal of the device, wherein: the contact probes includes a first group of contact probes adapted to come in contact with terminals of a first circuit in the device, and a second group of contact probes adapted to come in contact with terminals of a second circuit in the device; and the first plating layer is divided by a first groove into a first region including the first group of the contact probes and a second region including the second group of the contact probes, so that the first region and the second region are electrically insulated from one another.