A clothing dryer comprising: a body; a drum rotatably installed in the body, the drum receiving objects to be dried; a base arranged beneath the body; a dehumidifying unit mounted to the base, to condense moisture contained in air discharged from the drum; a water container to collect condensed water formed in the dehumidifying unit; and a water level sensing device to detect a level of the condensed water collected in the water container, comprising a floating unit movable in accordance with a variation in the level of the condensed water, and an electrode sensor, wherein the floating unit comprises a flotation member floating by buoyancy in accordance with the level of the condensed water, characterized in that the floating unit further comprises a conductor arranged at a top portion of the flotation member, the clothing dryer comprises a water container bottom plate to cover a bottom portion of the water container that comprises a floating guide to guide the floating unit to move in accordance with the variation in the level of the condensed water, and the electrode sensor is adapted to detect the level of the condensed water when the floating unit is raised to the maximum level and as such electrically connected with the conductor of the floating unit. a body; a drum rotatably installed in the body, the drum receiving objects to be dried; a base arranged beneath the body; a dehumidifying unit mounted to the base, to condense moisture contained in air discharged from the drum; a water container to collect condensed water formed in the dehumidifying unit; and a water level sensing device to detect a level of the condensed water collected in the water container, comprising a floating unit movable in accordance with a variation in the level of the condensed water, and an electrode sensor, wherein the floating unit comprises a flotation member floating by buoyancy in accordance with the level of the condensed water, characterized in that the floating unit further comprises a conductor arranged at a top portion of the flotation member, the clothing dryer comprises a water container bottom plate to cover a bottom portion of the water container that comprises a floating guide to guide the floating unit to move in accordance with the variation in the level of the condensed water, and the electrode sensor is adapted to detect the level of the condensed water when the floating unit is raised to the maximum level and as such electrically connected with the conductor of the floating unit. a floating unit movable in accordance with a variation in the level of the condensed water, and an electrode sensor, wherein the floating unit comprises a flotation member floating by buoyancy in accordance with the level of the condensed water, characterized in that the floating unit further comprises a conductor arranged at a top portion of the flotation member, the clothing dryer comprises a water container bottom plate to cover a bottom portion of the water container that comprises a floating guide to guide the floating unit to move in accordance with the variation in the level of the condensed water, and the electrode sensor is adapted to detect the level of the condensed water when the floating unit is raised to the maximum level and as such electrically connected with the conductor of the floating unit.