Sample analyzing tool

A sample analysis tool that has a simple structure and is capable of carrying out a blood cell separation of high hematocrit blood with a high separation ability is provided. The sample analysis tool according to the present invention includes a blood cell separation layer including a lateral flow filtration filter layer. For example, a sample analysis tool 1 in which a reagent layer 17 is formed on a substrate 11. The blood cell separation layer is stacked on the reagent layer 17. A part or a whole of an upper surface of the blood cell separation layer serves as a blood sample supplying portion. A part or a whole of a lower surface of the reagent layer 17 serves as a measuring portion. The blood sample supplied from the supplying portion is separated into blood cells and plasma by the blood cell separation layer. The plasma is introduced into the reagent layer 17, and a component in the plasma is measured in the measuring portion is formed to have a structure in which the blood cell separation layer includes a lateral flow filtration filter layer 13a. The blood sample introduced into the lateral flow filtration filter layer 13a is subjected to a blood cell separation while moving in a lateral flow direction.