Highly gas tight chamber and method of manufacturing same

A hermetically sealed aluminum or aluminum alloy chamber, hermetically enclosing internally packaged parts, manufactured by the steps of:

• (a) preparing two aluminum or aluminum alloy material members which face each other;
• (b) forming at least one extending groove portion on a surface to be metal-bonded of one of said two aluminum or aluminum alloy material members, which said groove portion extends in a manner to make an enclosure;
• (c) forming at least one corresponding extending protruding portions on a surface to be metal-bonded of the other of said two aluminum or aluminum alloy material members, wherein said protruding portion extends in a manner to make a corresponding enclosure;
• (d) forming an extending convex portion outside said extending groove portion and/or outside said extending protruding portion, wherein said convex portion extends in a manner to make an enclosure;
• and
• (e) receiving internally packaged parts therebetween, inserting said at least one extending protruding portion into said at least one extending groove portion and fitting said convex portion, and causing said at least one extending protruding portion and said at least one extending groove portion to be metal-bonded by press-forging.