The purpose of the present invention is to provide a biological component adhesion-suppressing material that is able to suppress adhesion of platelets and proteins even when coming into contact with blood, etc. The present invention comprises a substrate which is provided with a functional layer having, fixed on a surface thereof that comes into contact with a biological component, a polymer including a saturated aliphatic monocarboxylic acid vinyl ester unit, wherein: when compositional analysis is performed on the surface of the functional layer using a TOF-SIMS device, the number of carbon atoms in an aliphatic chain representing an ion signal detected for saturated aliphatic carboxylic acid is 2-20； and an XPS measurement taken of the surface of the functional layer shows a peak derived from an ester group.本發明之目的在於提供一種抑制生物體成分附著之材料，其即使與血液等接觸也能抑制血小板或蛋白質之附著。本發明提供一種抑制生物體成分附著之材料，其包含基材，該基材係在與生物體成分接觸之面上具備固定有含有飽和脂肪族單羧酸乙烯酯單元的高分子之機能層，以TOF-SIMS裝置組成分析前述機能層的表面時，所檢測出的飽和脂肪族單羧酸的離子訊號之脂肪族鏈碳數為2~20，以XPS測定前述機能層的表面時，來自酯基的波峰存在。
