AUTOMATED ANALYZER

Provided is a technique that opening and closing of a lid of a container such as a reagent bottle before and after dispensing or the like can be realized using a simpler structure and fewer numbers of drives than the related art regarding an automated analyzer.The automated analyzer includes a container installation portion in which a container (reagent bottle 3) having a protrusion 3B and an openable and closable lid 3A is installed and a lid opening and closing mechanism portion 4 for opening and closing the lid 3A. The lid opening and closing mechanism portion 4 includes an arm portion including an arm 5 and a horizontal driving portion which moves the arm 5 in a first horizontal direction. The arm 5 includes a protrusion contacting portion 5A. The protrusion contacting portion 5A includes a first surface having an angle greater than 0 degrees and less than 90 degrees when the horizontal surface is set as 0 degrees. The lid opening and closing mechanism portion 4 opens the lid 3A by moving the arm 5 in the first horizontal direction, contacting the protrusion 3B on the first surface of the protrusion contacting portion 5A, and then moving the protrusion 3B along a shape of the first surface in a vertical direction, when the lid 3A is opened.