Patent ID: 7648037

Claim:
A lid structure for opening and closing an opening formed in an upper portion of a reagent container holding a reagent inside, comprising: an outer lid member that is attached to the reagent container and has a first opening corresponding to the opening of the reagent container; an inner lid member that is arranged inward relative to the outer lid member, attached to the outer lid member in a vertically movable manner, and has a second opening opposing the first opening; and a rotator that has a through hole and is arranged inward relative to the inner lid member, engaging with each of the outer lid member and the inner lid member via an engaging unit in a rotatable manner around a horizontal axis, wherein the engaging unit rotates the rotator to makes the first opening and the second opening communicate with each other through the through hole to bring the opening into an open state when the inner lid member performs a downward opening operation, whereas the engaging unit rotates the rotator to cut the communication between the first opening and the second opening to bring the opening into a closed state when the inner lid member performs an upward closing operation.