Substrate for sample analysis, and sample analysis apparatus

A substrate for sample analysis used for causing a binding reaction between an analyte and a ligand in a liquid sample, the substrate for sample analysis comprising:

• a base substrate having a rotation axis and a predetermined thickness;
• a first chamber located in the base substrate and configured to hold a liquid sample containing an analyte and a ligand immobilized on a surface of magnetic particles;
• at least one magnet arranged at a first position where the magnetic particles are captured in the first chamber by the magnet;
• and
• a balancer arranged at a second position where, when the at least one magnet is attached, a center of gravity of the substrate generally coincide with the rotation axis, wherein
• the base substrate further includes (1) a second chamber at the first position, and (2) a third chamber at the second position, the second chamber having a first opening in a surface of the base substrate, the third chamber having a second opening in the surface of the base substrate,
• the at least one magnet is removably inserted into the second chamber through the first opening, and
• the balancer is removably inserted into the third chamber through the second opening.