AUTOMATIC ANALYSIS DEVICE

To provide an automatic analyzer improved in attachment workability of a cover covering above a reaction promotion unit.An automatic analyzer includes a reagent storage unit, a reaction promotion unit, and an unused container providing unit. The reaction promotion unit is located between the reagent storage unit and the unused container providing unit in a left-right direction, and is located on a rear side from the reagent storage unit and the unused container providing unit in a front-rear direction. In the automatic analyzer, a cover covering above the reaction promotion unit is provided with a fitting portion including a first fitting portion, a second fitting portion, and a third fitting portion located between the first fitting portion and the second fitting portion in the left-right direction and a handle that is positioned between the first fitting portion and the second fitting portion in the left-right direction and on a rear side of the third fitting portion in the front-rear direction, and the first fitting portion and the second fitting portion are high in positioning functionality and the third fitting portion is low in positioning functionality.