SOLUTION TEMPERATURE CONTROL DEVICE IN BIOLOGICAL CELL OBSERVING CHAMBER

A cell observation chamber 30 used in an apparatus for detecting cell chemotaxis and for isolating chemotactic cells comprises a first temperature controller 62 and a second temperature controller 63, the first temperature controller 62 being adapted to measure the temperature of solutions filling a pair of wells and a flow path in the chamber 30 and to control the solutions to be a predetermined temperature, and the second temperature controller 63 being adapted to measure the temperature of a heating section 64 that heats the chamber 30 from outside, thereby indirectly heats the solutions filling the pair of wells and the flow path, and to control the heating section 64 to be a predetermined preheating temperature. This makes it possible to observe a state where cells move from one to the other of the wells through the flow path and to measure the number of the cells precisely while keeping the solutions at the predetermined temperature, resulting in a dramatic improvement in the accuracy in controlling the temperature of the solutions.