It is to provide a glass panel unit, a working product of a glass panel unit, an assembly of a glass panel unit, and a method of manufacturing a glass panel unit capable of improving the yield.The glass panel unit (10) comprises a pair of glass panels (20, 30) opposed to each other, and a frame (40) between a pair of glass panels (20, 30) and a pair of glass panels (20, 30) hermetically joined together.The frame 40 has a frame like main body 401 and a reinforcing portion 43.The body portion (401) has a first portion (41) including a first sealing material having a first softening point, and a second portion (42) including a second sealing material having a second softening point higher than the first softening point.The reinforcing portion (43) includes a third sealing material having a third softening point higher than the first softening point, and is adjacent to the first portion (41) in a space (50) surrounded by a pair of glass panels (20, 30) and a body portion (401).
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