Capillary array unit and electrophoresis device

An electrophoresis device comprising:

• a capillary array unit including a capillary and a support that supports the capillary;
• the support comprising a first support section that holds the capillary in a curved state and a second support section that holds the capillary in a linear state;
• wherein the first support section includes a guide for moving the second support section in a predetermined direction;
• a liquid delivery mechanism having one end of the capillary being connected thereto and for delivering a separation medium to the capillary;
• a detection unit that emits light to a portion of the capillary and performs a measurement on a sample in the capillary;
• and
• a thermostat that houses the capillary therein and performs temperature control on the capillary,
• wherein the thermostat includes a heat source and a fan that sends air into the thermostat, and
• wherein the thermostat or the capillary array unit includes a straightening plate,
• the straightening plate having a flat plate-like shape, being arranged below a line on which the second support section moves, and not being arranged on the line on which the second support section moves, and
• the straightening plate being arranged to cause a rotational air flow along an inner wall of the thermostat caused in the thermostat by the fan to impinge on the straightening plate, and branch the rotational air flow into a plurality of branches of air flows, wherein at least one branch of air flow does not flow along an inner wall of the thermostat.