Frame piece, perspective window assembly and household appliance

The utility model provides a frame piece, a perspective window assembly and a household appliance, and relates to the technical field of household appliances. A first matching structure and a second matching structure which are arranged in a surrounding manner and form an included angle with each other are arranged on the frame piece, and each of the first matching structure and the second matching structure comprises at least one of a bulge and a recess; an included angle is formed between the arrangement direction of the first matching structure and the arrangement direction of the second matching structure. The perspective window assembly comprises a light-transmitting part, a hard frame part and a sealing frame part, the light-transmitting part is fixed on the hard frame part, and the sealing frame part is mounted in a mounting groove of the hard frame part; the hard frame piece and the sealing frame piece both adopt the frame piece, the first matching structure of the hard frame piece is matched with the