A sample analysis apparatus is provided with a structure for stopping rotation of a disc at a precise position. The sample analysis apparatus includes a disc configured to rotate on a rotation shaft and having at least one detection zone, an optical sensing apparatus configured to detect a reaction result at the at least one detection zone, at least one position determining protrusion provided on an exterior surface of the disc, a slider movably disposed to in a radial direction relative to the disc, and a stopper mounted to the slider and configured to stop rotation of the disc by blocking the at least one position determining protrusion.