To provide a miniaturized washer and a cabinet structure which may house a washer to house the washer in an existing cabinet of a kitchen or washstand.

A water pipe and drainage pipe are disposed in an existing cabinet and a washer pan for installing a small washer with dimensions not larger than 450 mm width, 710 mm height, and 450 mm depth, which includes a plurality of casters or rolls evenly placed for being drawn out forward or housed backward the small size washer, is set in the existing cabinet. Therefore, obstacle abutment of a baseboard or door of the existing cabinet is removed and flaws and soils of the existing cabinet are repaired.