A chilled reagent container comprises a reagent vessel containing part for containing therein a plurality of reagent vessels, a container lid including a container lid hole through which the reagent vessels contained by the reagent vessel containing part are accessible, and a cooling block for cooling the reagent vessels contained by the reagent vessel containing part, wherein the container lid slides to be changeable between an opened situation wherein the reagent is accessible from an outside and a closed situation wherein the reagent is prevented from being accessed from the outside, wherein the chilled reagent container further comprises a reagent container packing including another hole through which the reagent vessels are accessible and arranged between the container lid and the reagent vessel containing part to be pressed against the container lid.