A sample analysis device comprising a sample analysis unit and a reagent supply device comprising: (a) at least one reagent container (1, 111) comprising: a container body for storing a liquid reagent, the container body having an outlet portion; and a reagent supply port (5, 112) arranged on the container body; wherein the outlet portion of the container body and the reagent supply port (5, 112) each have a screw thread so as to be threadedly engaged with each other; (b) a support member (7, 113) for supporting the at least one reagent container (1, 111), so that the reagent supply port (5, 112) is positioned on a lower side of the container body, wherein the support member (7, 113) has holes (8, 114) into which the reagent supply ports (5, 112) of the reagent containers (1, 111) are fitted and nozzles (9, 115) are arranged in the holes (8, 114) so that acute ends thereof are directed in an upward direction, and (c) a housing (6, 120) for accommodating the one or plurality of reagent containers (1, 111), wherein the support member (7, 113) supports the at least one reagent container (1, 111) by supporting the housing (6, 120), such that when the housing (6, 120) is set on the support member (7, 113), the reagent supply ports (5, 112) exposed from the housing (6, 120) are fitted into the holes (8, 114) so that the nozzles (9, 115) are inserted into the nozzle penetration portions, wherein the reagent supply port (5, 112) comprises a plug body and at least one nozzle penetration portion, wherein the plug body and the at least one nozzle penetration portion are joined to each other at flanges thereof; and the at least one nozzle penetration portion is formed of a material having a Shore hardness of from A5° to A90°. (a) at least one reagent container (1, 111) comprising: a container body for storing a liquid reagent, the container body having an outlet portion; and a reagent supply port (5, 112) arranged on the container body; wherein the outlet portion of the container body and the reagent supply port (5, 112) each have a screw thread so as to be threadedly engaged with each other; a container body for storing a liquid reagent, the container body having an outlet portion; and a reagent supply port (5, 112) arranged on the container body; (b) a support member (7, 113) for supporting the at least one reagent container (1, 111), so that the reagent supply port (5, 112) is positioned on a lower side of the container body, wherein the support member (7, 113) has holes (8, 114) into which the reagent supply ports (5, 112) of the reagent containers (1, 111) are fitted and nozzles (9, 115) are arranged in the holes (8, 114) so that acute ends thereof are directed in an upward direction, and (c) a housing (6, 120) for accommodating the one or plurality of reagent containers (1, 111), wherein the support member (7, 113) supports the at least one reagent container (1, 111) by supporting the housing (6, 120), such that when the housing (6, 120) is set on the support member (7, 113), the reagent supply ports (5, 112) exposed from the housing (6, 120) are fitted into the holes (8, 114) so that the nozzles (9, 115) are inserted into the nozzle penetration portions,