Housing fixing structure and sunshade

The utility model discloses a cover shell fixing structure and a sunshade. The cover shell fixing structure comprises a cover shell with an opening in the front side, a wall base installed outside the cover shell and a support in the cover shell. The housing comprises a top plate, side plates and a bottom plate; a bending structure is arranged on the side plate and comprises a first groove and a second groove; the second groove is positioned on the outer side of the first groove; the wall base comprises an outer vertical wall, a first connecting part and an outer bottom wall; the first connecting part obliquely and upwards extends into the first groove; the support comprises an inner vertical wall, a second connecting part hooked into the second groove and an inner bottom wall; the first connecting part of the wall base and the second connecting part of the support are mutually hooked together across the thin wall of the side plate of the housing; the bottom of the wall base, the bottom of the housing and the