The present invention relates to a laundry processing apparatus comprising: a tub for storing water and having an opening for putting in and taking out laundry; a drum, provided in the interior of the tub, for storing the laundry supplied through the opening; an agitator rotatably provided inside the drum; a fixed body fixed to the drum; a drum fixing part having a body-penetrating hole provided so as to penetrate the fixed body, and an accommodating body which is fixed to the fixed body and the cross-sectional surface of which is concentric with the body-penetrating hole; a rotating shaft connected to the agitator by penetrating the tub and drum, and inserted into the body-penetrating hole; a drive gear positioned inside the accommodating body and fixed to the rotating shaft; a driven gear provided along the inner circumferential surface of the accommodating body; at least two connecting gears connecting the drive gear and driven gear; a housing to which each connecting gear is rotatably fixed and which rotates inside the accommodating body due to the connecting gears; and a housing stopper, provided on at least one from among the housing and fixed body, for stopping the rotation of the housing when the rotating shaft has rotated by a previously set number of times.