Glass panel unit manufacturing method, building component manufacturing method, glass panel unit manufacturing system, and glass panel unit

A glass panel unit manufacturing method, comprising:

• an arrangement step of stacking a first substrate, including a wired glass pane, and a second substrate, including a non-wired glass pane, one upon the other with a first sealant in a frame shape interposed between the first substrate and the second substrate;
• a bonding step of bonding together the first substrate and the second substrate with the first sealant to create an inner space surrounded with the first sealant between the first substrate and the second substrate;
• a pressure reducing step of producing a reduced pressure in the inner space through an exhaust port that the first substrate has;
• and
• a sealing step of sealing the exhaust port up while maintaining the reduced pressure in the inner space, wherein
• the sealing step includes irradiating a second sealant, inserted into the exhaust port, with an infrared ray externally incident through the second substrate to locally heat the second sealant and thereby seal the exhaust port up with the second sealant that has melted,
• the second sealant does not protrude from the exhaust port, and
• the sealing step includes pressing and expanding the second sealant in the inner space to bond the second sealant onto both of the first substrate and the second substrate.