A device for sampling blood and measuring erythrocyte sedimentation rate which comprises: a tube with one end closed and comprising a blood sampling portion on the open end side of said tube and an erythrocyte sedimentation rate measuring portion extending from said blood sampling portion; a stoppering means for stoppering the open end of said tube to keep the inside of said tube at a vacuum, said stoppering means being capable of being pierced with a blood drawing needle; and a partition member located within said tube and which extends substantially over the entire length of said tube. A blood is directly sampled into the device and the mixing of the sampled blood with a solution of an anticoagulant is performed with a high efficiency in the device. Accordingly, the operation of measuring erythrocyte sedimentation rate can be performed quickly and easily.