Jig for leak check

A jig for leak check, comprising:

• a jig body constituted by at least two joinable members joined together so that an inner surface of said jig body defines an inner space in said jig body;
• a closed chamber provided in said jig body for receiving a hollow checked object therein and formed so as to have a surface of which at least a part is intimately contacted with an outer surface of said hollow checked body;
• pressurized gas supply means provided through a wall of said check body so as to hermetically communicate with said hollow checked object;
• leak lead-out means provided on at least a part of said surface of said closed chamber;
• and
• leak transfer means provided through said wall of said jig body so as to cause said leak lead-out means to communicate therethrough with an exterior of said jig body;
• wherein said closed chamber is formed in said inner space of said jig body;
• and further comprising an air bag made of a flexible and stretchable material and received in said inner space of said jig body;
• said air bag being formed with a depression which cooperates with a part of said inner surface of said jig body to form said closed space;
• said outer surface of said hollow checked object being intimately contacted with a surface of said depression;
• wherein said joinable members comprise a box-like main member and a lid-like member;
• and
• wherein said depression is opened towards said lid-like member and said part of said inner surface of said jig body is an inner surface of said lid-like member.