BLOOD COLLECTION CONTAINER AND PLASMA SEPARATION METHOD

There is provided a blood collection container capable of suppressing the contamination of white blood cells into blood plasma. A blood collection container according to the present invention is a blood collection container into which a predetermined amount of blood is collected. The blood collection container includes a blood collection container main body, and a blood plasma separation material, an osmotic pressure regulator, and an anticoagulant contained in the blood collection container main body. The specific gravity of the blood plasma separation material at 25° C. is 1.030 or more and 1.120 or less. When the osmotic pressure regulator and the anticoagulant contained in the blood collection container main body are dissolved in an amount of physiological saline solution equivalent to a predetermined amount of blood collected in the blood collection container to obtain an osmotic pressure measurement solution, the specific gravity of the blood plasma separation material at 25° C. and the osmotic pressure of the osmotic pressure measurement solution satisfy a specific relationship.