Patent ID: 8556828

Claim:
A blood test apparatus comprising: a housing which comprises a chassis; an internal cylinder body which is provided at one side of the housing; a reciprocator that moves back and forth inside the internal cylinder body; a blood collection needle which is connected to the reciprocator; a blood sensor to which the blood collection needle is directed and provided at a tip part of the internal cylinder body, the blood sensor having a base plate; a storage which is provided in the base plate and which collects blood from skin punctured with the blood collection needle; a supply channel, one end of which is connected to the storage, and into which the blood in the storage flows by capillary action; an air hole provided at an other end of the supply channel; a detector provided inside the supply channel; a plurality of detection electrodes which configure the detector; and a plurality of connection electrodes provided on an outer periphery of the base plate being derived from each of the plurality of detection electrodes; a measuring circuit to which a signal of the blood sensor is supplied; a negative pressure provider which is drivable in dependence on the measuring circuit; and an external cylinder body which covers the internal cylinder body and comprises an opening part at a tip side of the internal cylinder body, and is provided so as to be movable relative to the internal cylinder body and to return to a predetermined relative position, wherein the negative pressure provider is configured to create a negative pressure inside the external cylinder body.