Joined unit of glass base members, and airtight envelope

A joined unit of glass base members, comprising:

• a first glass base member;
• a second glass base member;
• and
• a joining member which joins the first glass base member and the second glass base member, the joining member (a) having a viscosity that has a negative temperature coefficient, and (b) extending at a predetermined width along opposing surfaces of the first glass base member and the second glass base member,
• wherein at least one of the first glass base member and the second glass base member is elastically deformed while being depressed in an internal direction of the glass base member at an end portion in a widthwise direction of the joining member,
• wherein a boundary between an elastically deformed portion of the glass base member and the joining member is positioned farther toward an internal side of the glass base member as compared with a boundary between a non-elastically deformed portion of the glass base member and the joining member,
• wherein an area formed at the end portion in the widthwise direction of the joining member has a residual stress in a thickness direction of the joining member that is a compressive stress, and
• wherein the area formed at the end portion in the widthwise direction of the joining member has a greater compressive stress than a compressive stress of an area formed at a central portion in the widthwise direction of the joining member.