A washing method used in a washing device comprising: a laundry tub configured to spin about a rotational axis that is horizontal or is inclined towards the horizontal direction from the vertical direction, and configured to hold laundry in the interior of the laundry tub; a casing surrounding the laundry tub, and configured to be supplied with a washing liquid; a bumpy curved surface provided on the inner wall surface of the laundry tub, and bumpy in the radial direction of the laundry tub; and at least one baffle protruding from the inner wall surface of the laundry tub in the radial direction of the laundry tub, the height of the baffle being greater than the height of the convex part of the bumpy curved surface in the radial direction of the laundry tub, the method being characterized by comprising the steps of a first washing step of washing the laundry by suspending the laundry in a washing liquid supplied to the laundry tub, wherein a first liquid level (hf) of the washing liquid in the first washing step is set anywhere between a height that is at or above a rotational axis of the laundry tub and a height that is higher than the very top of the laundry tub; a second washing step of washing the laundry by agitating the laundry by the baffle with the washing liquid at a lower liquid level than the first liquid level (hf) of the washing liquid supplied to the laundry tub in the first washing step, wherein a second liquid level of the washing liquid in the second washing step is set lower than the rotational axis of the laundry tub; a third washing step of washing the laundry by continuously increasing or decreasing the liquid level of the washing liquid while spinning the laundry tub between the first liquid level (hf) of the washing liquid and the second liquid level of the washing liquid. a laundry tub configured to spin about a rotational axis that is horizontal or is inclined towards the horizontal direction from the vertical direction, and configured to hold laundry in the interior of the laundry tub; a casing surrounding the laundry tub, and configured to be supplied with a washing liquid; a bumpy curved surface provided on the inner wall surface of the laundry tub, and bumpy in the radial direction of the laundry tub; and at least one baffle protruding from the inner wall surface of the laundry tub in the radial direction of the laundry tub, the height of the baffle being greater than the height of the convex part of the bumpy curved surface in the radial direction of the laundry tub, the method being characterized by comprising the steps of a first washing step of washing the laundry by suspending the laundry in a washing liquid supplied to the laundry tub, wherein a first liquid level (hf) of the washing liquid in the first washing step is set anywhere between a height that is at or above a rotational axis of the laundry tub and a height that is higher than the very top of the laundry tub; a second washing step of washing the laundry by agitating the laundry by the baffle with the washing liquid at a lower liquid level than the first liquid level (hf) of the washing liquid supplied to the laundry tub in the first washing step, wherein a second liquid level of the washing liquid in the second washing step is set lower than the rotational axis of the laundry tub; a third washing step of washing the laundry by continuously increasing or decreasing the liquid level of the washing liquid while spinning the laundry tub between the first liquid level (hf) of the washing liquid and the second liquid level of the washing liquid.