Automatic analysis device

An automatic analysis device, comprising:

• a heat block which includes a plurality of positions on which reaction containers in which reaction liquid mixing a reagent and a sample is injected are mounted;
• and
• a strip-shaped heater which heats the heat block,
• wherein the strip-shaped heater is wound and attached on an outer circumference of the heat block so that both end regions of the strip-shaped heater are adjacent to each other,
• wherein the strip-shaped heater includes a heat generating resistor which generates heat by applying an electric current, an insulating film which electrically insulates with respect to an outside portion by disposing to sandwich the heat generating resistor, and a first and a second electricity feeding lines which are attached to both end portions of the heat generating resistor and supply power to the heat generating resistor,
• wherein both end regions of the strip-shaped heater are disposed side by side in a direction perpendicular to the longitudinal direction of the strip-shaped heater,
• wherein the heat generating resistor has a uniform cross-sectional area width perpendicular to an electric current applying direction through which the first electricity feeding line and the second electricity feeding line are passed, and
• wherein a junction portion to which the first electricity feeding line is joined and a junction portion to which the second electricity feeding line is joined are positioned on both end portion sides of the heat generating resistor other than a position aligned in a direction perpendicular to the longitudinal direction of the strip-shaped heater.