Blood collection instrument and blood collection plate

A blood collection instrument comprising:

• a blood holding member having a structure in which a plurality of plate-shaped members are overlapped with each other, the blood holding member including a collected blood holding passage formed between overlapped surfaces of the plurality of plate-shaped members;
• a connection part provided at an inflow port portion of the collected blood holding passage in the blood holding member;
• and
• a puncture member including a hollow needle for puncture, the puncture member being connected to the connection part, wherein
• an inner hole of the hollow needle of the puncture member is allowed to communicate with the collected blood holding passage of the blood holding member,
• the collected blood holding passage is formed in a noncircular shape in cross section between the overlapped surfaces of the plurality of plate-shaped members, and
• an inner hole of the connection part constituting the inflow port portion of the collected blood holding passage is more circularly shaped than the collected blood holding passage in cross section.