Patent ID: 7656175

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 include a power supply contact probe adapted to supply power; and the first through holes include at least one through hole an inner face of which is not provided with the first plating layer, and adapted to hold the power supply contact probe.