An analyzer, comprising: a casing; a first shaft member supported by the casing to be rotatable about a rotational axis (Axl, Ax2), and formed with a first through-hole extending in the rotational axis (Axl, Ax2); a second shaft member inserted into the first through-hole and supported by the casing via the first shaft member to be rotatable about the rotational axis (Axl, Ax2) with respect to the casing and the first shaft member; a first rotational support (31A, 33A) capable of supporting a container (32, 34) and coupled to the first shaft member to be integrally rotatable with the first shaft member; a second rotational support (31B, 33B) capable of supporting another container (32, 34) and coupled to the second shaft member to be integrally rotatable with the second shaft member; a first drive mechanism configured to rotate the first shaft member about the rotational axis (Axl, Ax2); a second drive mechanism configured to rotate the second shaft member about the rotational axis (Axl, Ax2); a cylindrical member formed with a second through-hole extending in the rotational axis (Axl, Ax2) and into which the first shaft member and the second shaft member are inserted, and disposed on the casing; a plurality of bearings (76, 77) intervening between the cylindrical member and the first shaft member and separated from each other in the direction of the rotational axis (Axl, Ax2); a housing formed with a third through-hole into which the first shaft member and the second shaft member are inserted, coupled to the casing, and configured to accommodate the first rotational support (31A, 33A), the container (32, 34) supported by the first rotational support (31A, 33A), the second rotational support (31B, 33B), the container (32, 34) supported by the second rotational support (31B, 33B); and wherein the casing has a wall formed with a fourth through-hole communicating with the second through-hole, and the cylindrical member is disposed on the wall in the direction of the rotational axis (Axl, Ax2), and the housing includes a main body characterized in that the housing further includes a cover, the main body is coupled to the wall of the casing via pillars and the analyzer further comprises a gasket filling a gap formed outside the housing at a position between the housing and the cylindrical member, and communicating with the third through-hole. a casing; a first shaft member supported by the casing to be rotatable about a rotational axis (Axl, Ax2), and formed with a first through-hole extending in the rotational axis (Axl, Ax2); a second shaft member inserted into the first through-hole and supported by the casing via the first shaft member to be rotatable about the rotational axis (Axl, Ax2) with respect to the casing and the first shaft member; a first rotational support (31A, 33A) capable of supporting a container (32, 34) and coupled to the first shaft member to be integrally rotatable with the first shaft member; a second rotational support (31B, 33B) capable of supporting another container (32, 34) and coupled to the second shaft member to be integrally rotatable with the second shaft member; a first drive mechanism configured to rotate the first shaft member about the rotational axis (Axl, Ax2); a second drive mechanism configured to rotate the second shaft member about the rotational axis (Axl, Ax2); a cylindrical member formed with a second through-hole extending in the rotational axis (Axl, Ax2) and into which the first shaft member and the second shaft member are inserted, and disposed on the casing; a plurality of bearings (76, 77) intervening between the cylindrical member and the first shaft member and separated from each other in the direction of the rotational axis (Axl, Ax2); a housing formed with a third through-hole into which the first shaft member and the second shaft member are inserted, coupled to the casing, and configured to accommodate the first rotational support (31A, 33A), the container (32, 34) supported by the first rotational support (31A, 33A), the second rotational support (31B, 33B), the container (32, 34) supported by the second rotational support (31B, 33B); and wherein the casing has a wall formed with a fourth through-hole communicating with the second through-hole, and the cylindrical member is disposed on the wall in the direction of the rotational axis (Axl, Ax2), and the housing includes a main body characterized in that the housing further includes a cover, the main body is coupled to the wall of the casing via pillars and the analyzer further comprises a gasket filling a gap formed outside the housing at a position between the housing and the cylindrical member, and communicating with the third through-hole.