Automatic analyzer, uncovering mechanism, and uncovering method

An automatic analyzer for dispensing a specimen and a reagent into each of a plurality of reaction containers to cause a reaction, and measuring a liquid obtained by the reaction, the automatic analyzer comprising:

• a reagent disk configured to accommodate a reagent bottle accommodating the reagent;
• and
• an uncovering mechanism including a piercing needle configured to break a lid of the reagent bottle to be conveyed to the reagent disk or the reagent bottle conveyed to the reagent disk, wherein
• the piercing needle includes
• a first step blade portion constituting a tip end of the piercing needle and configured to break the lid from a center portion of the lid toward a peripheral portion of the lid, and
• a second step blade portion configured to break the lid from the peripheral portion of the lid to the center portion of the lid.