An automated analyzer comprising: a reagent refrigerator that is adapted to cold-insulate a reagent stored in a container having a lid which is rotationally moved centering on the fulcrum and is adapted to be opened and closed; and an analysis portion that is adapted to analyze a reaction liquid generated by mixing the reagent separated from the container in the reagent refrigerator with a sample, wherein the reagent refrigerator includes a container holder that is mounted with a plurality of sets of the containers, a lid opening/closing mechanism that is adapted to rotationally move the lids of the container mounted on the container holder so as to open or close the lids, and a lid holding mechanism that is adapted to come into contact with a part of the lid in a state in which the lid is opened by the lid opening/closing mechanism, characterized in that the lid holding mechanism is adapted to maintain the lid at an opening position and to hold the lid of a container located at a dispensing/stirring position where dispensing and stirring of a reagent are performed, the lid holding mechanism is fixed to an inner circumferential disk base at the inside of the reagent refrigerator, the lid holding mechanism includes: a holding mechanism base part that is fixed to the reagent refrigerator; a holding drive part that has a protrusion which is adapted to be rotationally moved in a direction which is different from a rotational movement direction of the lid centering on a support pin, so as to come into contact with the lid, and which is adapted to maintain an open state of the lid; and an elastic member that has one end fixed to the holding mechanism base part and the other end fixed to the holding drive part, and is adapted to generate a bias force with respect to the holding drive part, and in a case where the lid transitions from a closed state to an open state, the holding drive part is adapted to come into contact with the lid, and is adapted to be rotationally moved centering on the support pin to a position where the lid is not hindered from being rotationally moved when an external force is applied to the holding drive part, and in a case where the lid is in the open state, the holding drive part is adapted to rotationally move the protrusion to a position where the open state of the lid is maintained, due to a biasing force of the elastic member. a reagent refrigerator that is adapted to cold-insulate a reagent stored in a container having a lid which is rotationally moved centering on the fulcrum and is adapted to be opened and closed; and an analysis portion that is adapted to analyze a reaction liquid generated by mixing the reagent separated from the container in the reagent refrigerator with a sample, wherein the reagent refrigerator includes a container holder that is mounted with a plurality of sets of the containers, a lid opening/closing mechanism that is adapted to rotationally move the lids of the container mounted on the container holder so as to open or close the lids, and a lid holding mechanism that is adapted to come into contact with a part of the lid in a state in which the lid is opened by the lid opening/closing mechanism, characterized in that the lid holding mechanism is adapted to maintain the lid at an opening position and to hold the lid of a container located at a dispensing/stirring position where dispensing and stirring of a reagent are performed, the lid holding mechanism is fixed to an inner circumferential disk base at the inside of the reagent refrigerator, the lid holding mechanism includes: a holding mechanism base part that is fixed to the reagent refrigerator; a holding drive part that has a protrusion which is adapted to be rotationally moved in a direction which is different from a rotational movement direction of the lid centering on a support pin, so as to come into contact with the lid, and which is adapted to maintain an open state of the lid; and an elastic member that has one end fixed to the holding mechanism base part and the other end fixed to the holding drive part, and is adapted to generate a bias force with respect to the holding drive part, and a holding mechanism base part that is fixed to the reagent refrigerator; a holding drive part that has a protrusion which is adapted to be rotationally moved in a direction which is different from a rotational movement direction of the lid centering on a support pin, so as to come into contact with the lid, and which is adapted to maintain an open state of the lid; and an elastic member that has one end fixed to the holding mechanism base part and the other end fixed to the holding drive part, and is adapted to generate a bias force with respect to the holding drive part, and in a case where the lid transitions from a closed state to an open state, the holding drive part is adapted to come into contact with the lid, and is adapted to be rotationally moved centering on the support pin to a position where the lid is not hindered from being rotationally moved when an external force is applied to the holding drive part, and in a case where the lid is in the open state, the holding drive part is adapted to rotationally move the protrusion to a position where the open state of the lid is maintained, due to a biasing force of the elastic member.