Abstract: An object of the present disclosure is to provide a chamber with which inspection conditions of a leak test performed on workpieces of different sizes can easily be managed. The chamber according to an aspect of the present disclosure is a chamber used in a leak tester, and includes: a main chamber for housing a workpiece; a sub-chamber that communicates with the main chamber; and a volume changing mechanism for changing the volume of the sub-chamber, wherein the volume changing mechanism changes the volume of the sub-chamber such that a total volume of a space on the outside of the workpiece in the main chamber and the sub-chamber remains constant with respect to workpieces of different sizes.

Abstract: An object of the present invention is to provide a chamber in which workpieces of different sizes can be positioned. A chamber according to an aspect of the present invention is a chamber for a leak tester, the chamber housing in the interior thereof a workpiece having an opening, the chamber including: a first member having a recess that forms a housing space for the workpiece; a second member adapted to close an open end of the recess; and a positioning mechanism for positioning the workpiece within the housing space such that the opening is in a predetermined position, wherein the positioning mechanism holds the workpiece apart from the first member and the second member.