Electrophoresis apparatus and electrophoresis method

An electrophoresis method using an electrophoresis apparatus including:

• a separation medium for electrophoretically separating a biological substance;
• a buffer solution tank containing a buffer solution;
• a recovery chamber for recovering a target biological substance;
• a separation wall separating the buffer solution tank and the recovery chamber, the separation wall controlling a flow of the buffer solution between the buffer solution tank and the recovery chamber according to a water level of the buffer solution;
• a position detector that detects a position of the target biological substance that is electrophoresed in the separation medium;
• and
• a water level control unit,
• the electrophoresis method comprising causing the water level control unit to control the water level of the buffer solution in the buffer solution tank according to the position of the target biological substance.