Blood component collection cassette and manufacturing method of the same

A blood component collection cassette, comprising:

• a cassette main body, where a flow path is formed, and that is configured to be mountable to a blood component separation device,
• wherein a sheet-shaped filter member for trapping a substance where blood components coagulate is arranged in the flow path in the cassette main body,
• wherein the cassette main body has a filter housing that houses the filter member,
• wherein a first tube having an inner cavity communicating with an inner space of the filter housing and a second tube having an inner cavity communicating with the inner space at a position different from a position where the first tube communicates with the inner space are arranged in the cassette main body,
• wherein the inner space is separated by the filter member into a first space on the side of the first tube and a second space on the side of the second tube,
• wherein the cassette main body has a first sheet and a second sheet which are formed of a soft material,
• wherein the first sheet and the second sheet are superposed in a thickness direction,
• wherein the flow path is formed between the first sheet and the second sheet,
• wherein the first tube and the second tube are sandwiched between the first sheet and the second sheet in the thickness direction, and
• wherein the first tube and the second tube are physically separate elements from the first sheet and the second sheet.