Glass panel unit and method for manufacturing the glass panel unit

A glass panel unit comprising:

• a first substrate including a first glass panel;
• a second substrate including a second glass panel and arranged to face the first substrate;
• and
• a frame-shaped sealing portion that is hermetically bonded to the first substrate and the second substrate so as to create an evacuated space between the first substrate and the second substrate,
• the first substrate having a part arranged to stick out of an edge of the second substrate when viewed from a region where the second substrate is positioned with respect to the first substrate,
• the part including a mounting portion used to mount the glass panel unit onto a vehicle,
• the mounting portion comprising at least one mounting hole penetrating through the part,
• the first substrate and the second substrate curving alongside of each other,
• the part being a flat part.