Abstract: A door comprises a main frame with an opening, a front window frame and a rear window frame. The main frame includes a connection mold formed along an inner circumference of the opening and formed with a plurality of projections and recessed hooking channels. A glass is disposed in the opening and fixed by the front window frame and the rear window frame. The front window frame includes catching protrusions to be fitted into the recessed hooking channels, a support end to support the glass, and hooks protruding rearward and resiliently hooked to a rear side of the projections. The rear window frame includes catching protrusion to be fitted into the other recessed hooking channels, a support end to support the glass, and hooks protruding frontward and resiliently hooked to a front side of the projections.