Analysis device

An analysis device comprising:

• a liquid sending pump that supplies an eluent;
• a first separation column used for an analysis of a sample;
• a first sample supplier that supplies a sample to the first separation column;
• a second separation column used for separation of a sample;
• a second sample supplier that supplies a sample to the second separation column;
• a detector that detects a sample that has passed through the first separation column or the second separation column;
• and
• a flow-path switching valve that is switchable between a first flow-path switch-state in which the eluent that has been supplied by the liquid sending pump is guided to the first separation column and a sample that has passed through the first separation column is guided to the detector and a second flow-path state in which the eluent that has been supplied by the liquid sending pump and part of a sample that has passed through the second separation column are guided to the detector;
• and
• a merging pipe that is provided at a position farther downstream than the second separation column and includes a first inlet pipe, a second inlet pipe and an outlet pipe,
• wherein the first inlet pipe is connected to the second separation column,
• the flow-path switching valve connects the liquid sending pump to a position farther upstream than the first sample supplier in the first flow-path state, and
• the flow path switching valve connects the liquid sending pump to the second inlet pipe and connects the detector to the outlet pipe in the second flow-path state.