Metal jointed body, semiconductor device, wave guide tube, and method for joining members to be joined

A wave guide tube with a tubular shape having a cavity therein, wherein

• a part of a side wall of the wave guide tube is joined by a metal jointed body, the metal jointed body comprising:
• an Ag—Zn—Al alloy layer;
• and
• an Al—Ag alloy layer provided on both sides of the Ag—Zn—Al alloy layer.

A method for joining members to be joined in which a laminated body is used, the laminated body is such that a Zn layer is joined and laminated on an Al layer which is an Al substrate serving as a member to be joined or an Al film formed on a member to be joined, and an Ag layer is joined and laminated on a surface opposite to a surface of the Zn layer joined on the Al layer, the method comprising the steps of:

• a first step of making each of the Ag layers of the two laminated bodies opposed to each other and bringing the Ag layers into contact with each other;
• and
• a second step of performing heating the two laminated bodies with the Ag layers in contact with each other while pressurizing, wherein
• the Zn layer is 0.1 μm or more and 2 μm or less in thickness, and
• the Ag layer is 0.1 μm or more and 50 μm or less in thickness.