Patent ID: 8158080

Claim:
A biosensor, comprising: a measuring layer configured to measure whether reaction to a biological sample has occurred; an upper cover disposed on a top of the measuring layer, and provided with an open window having a first width configured to allow a measurement area of the measuring layer to be exposed and an upper protrusion configured to be spaced apart from an outer portion of the open window by a predetermined distance and configured to protrude in a direction in which the upper protrusion is coupled to a lower panel; and the lower panel disposed below the measuring layer, and provided with a lower protrusion configured to protrude between the open window and the upper protrusion of the upper cover to form the measurement area having a second width, the second width being smaller than the first width, wherein the lower protrusion is spaced apart from the upper protrusion by a predetermined gap and is configured to press the measuring layer so that a top of the measuring layer upwardly protrudes from the open window.