PURPOSE: To more surely prevent mositure from entering the outlet part of a storing part, and to prevent such a trouble that a powdered detergent falls therefore, in the title device wherein the powdered detergent is stored in the storing part and is supplied by being taken out of the outlet part of the storing part.

CONSTITUTION: The title device is so composed that an outlet part 10 for a hopper 6, in which a powdered detergent 7 is stored, is formed in cylindrical form, that a cylindrical cap 16 with a bottom, which is put on the outlet part 10, is provided, and that this cap 16 is forcibly pushed by a coiled compression spring in the direction of opening and shutting of the outlet part 10 and is moved at the position, at which the detergent is supplied, by a motor 22 when the detergent is supplied. In this case, it is preferable that a packing sheet 18 in close contact with the periphery of the outlet part 10 be provided at the inner peripheral part of the cap. When the cap 16 has detergent-passing opening 17 on the peripheral part thereof, it is preferable that the packing sheet 18 be provided at the inner part of the detergent-passing opening 17.