Automatic analyzer

An automatic analyzer for analyzing a specimen, comprising:

• a reagent dispensing unit configured to dispense a reagent from a reagent bottle in which a plurality of reagent vessels storing reagents used for the analysis of the specimen are arranged in one direction,
• a reagent rack in which the reagent bottle is stored, wherein the reagent rack includes a lid opening unit configured to open a lid corresponding to an upward opening of one of the plurality of reagent vessels along the one direction in which the plurality of reagent vessels are arranged, and a lid fixing unit configured to fix the lid outside of a path where the reagent dispensing unit is inserted into the upward opening, and
• a lid support unit configured to move vertically along a fixed shaft, such that upward movement of the lid support unit is configured to cause the lid opening unit to open the lid, wherein
• the lid includes a protrusion that protrudes in a direction orthogonal to the one direction in which the reagent vessels are arranged and along which the lid opens,
• the lid opening unit is a slope provided on an upper surface of the reagent rack, on which the protrusion slides, and
• the lid fixing unit is a wall surface that forms an angle equal to or larger than a right angle with a bottommost surface of the slope.