Washing machine

A washing machine with a drying function, comprising:

• a tub to store washing water and including a plurality of exhaust ports, at least one exhaust port of the plurality of exhaust ports:
• is a distance from a center of a rear surface of the tub that is different from a distance from the center of the rear surface of the tub in comparison to another exhaust port of the plurality of exhaust ports, and/or
• has a width that is different from a width of another exhaust port of the plurality of exhaust ports, and/or
• has a diameter that is different from a diameter of another exhaust port of the plurality of exhaust ports;
• a drum inside the tub and including:
• a cylindrical body having a front end opening and a rear end opening, and
• a drum back coupled to the cylindrical body so as to be over the rear end opening of the cylindrical body and including:
• a plurality of recess portions recessed from a rear of the drum back toward a front of the drum,
• a plurality of openings formed between each adjacent recess portions of the plurality of recess portions, and
• a plurality of porous plates respectively corresponding, and respectively coupled, to the plurality of openings;
• a motor to provide a rotational force to the drum;
• a flange shaft between the drum and the motor to transmit the rotational force of the motor to the drum and including:
• a hub at a center of the drum back, and
• a plurality of flange portions extending radially from the hub and respectively corresponding to the plurality of recess portions;
• a drying duct configured to supply heated air into the tub;
• and
• an exhaust duct configured to return the heated air from the tub through the plurality of porous plates and the plurality of exhaust ports to the drying duct.