Abstract: A frame device includes a back board, a buckle member and a casing. The back board has a groove. The buckle member is disposed on the back board, and has a first part member and the second part member disposed corresponding to the groove, and a distance between the first part member and the second part member varies along a direction. The casing is provided with a hook having a first engaging part and a second engaging part, and a distance between the first engaging part and the second engaging part varies along the direction. The first part member is engaged with the first engaging part, and the second part member is engaged with the second engaging part.