Gasket for small size electronic appliance

A waterproof gasket adapted to be retained to a gasket retention groove provided in one of first and second case members forming an outer shell case of a small size electronic appliance, said waterproof gasket comprising:

• straight portions and corner portions provided alternately in a peripheral direction corresponding to outer peripheral shapes of said first and second case members;
• a main seal portion formed to be brought into close contact with another of said first and second case members;
• and
• a seat seal portion formed to be brought into close contact with a bottom surface of said gasket retention groove;
• wherein said straight portion is configured to have a shoulder portion protruding out in a width direction between said main seal portion and the seat seal portion so as to be brought into close contact with an inner side surface of a groove shoulder of said gasket retention groove, and
• wherein said corner portion is configured to have a recession portion retracting in a width direction relatively from said shoulder portion between said main seal portion and the seat seal portion.