An apparatus for treating laundry, comprising: a front cover that forms a front surface and that includes a backward bent portion (12a1) at an upper end portion of the front surface extending in a backward direction; a pair of side covers that form both flank surfaces, respectively, a back cover that forms a rear-side surface; an outer tank provided for holding water and positioned inside the front cover, the pair of side covers and the back cover; an inner tank that is positioned rotatably inside the outer tank and providing for holding laundry; a motor for rotating the inner tank; a front member that is connected to the backward bent portion (12a1) and that extends in a leftward-rightward direction along the backward bent portion (12a1); and a top cover that is connected to an upper end of the front cover, upper ends of the pair of side covers and an upper end of the back cover, characterized by a hanger that is fixed to upper-side both-end portions of the front cover; a tension member of which one end is connected to the hanger and of which the other end is connected to the outer tank; wherein the front member includes: a pair of hanger connection units arranged on both end portions of the front member, respectively, and connected to the hanger; a gap formation portion (115a, 115b, 115c) that is positioned by a distance upward from an upper-side surface of the backward bent portion (12a1) and thus forms a gap (g); and a fixation portion that is connected to the upper-side surface of the backward bent portion; wherein the top cover includes a backward protrusion portion that protrudes backward from a front lower end of the top cover and is inserted into the gap (g). a front cover that forms a front surface and that includes a backward bent portion (12a1) at an upper end portion of the front surface extending in a backward direction; a pair of side covers that form both flank surfaces, respectively, a back cover that forms a rear-side surface; an outer tank provided for holding water and positioned inside the front cover, the pair of side covers and the back cover; an inner tank that is positioned rotatably inside the outer tank and providing for holding laundry; a motor for rotating the inner tank; a front member that is connected to the backward bent portion (12a1) and that extends in a leftward-rightward direction along the backward bent portion (12a1); and a top cover that is connected to an upper end of the front cover, upper ends of the pair of side covers and an upper end of the back cover, characterized by a hanger that is fixed to upper-side both-end portions of the front cover; a tension member of which one end is connected to the hanger and of which the other end is connected to the outer tank; wherein the front member includes: a pair of hanger connection units arranged on both end portions of the front member, respectively, and connected to the hanger; a gap formation portion (115a, 115b, 115c) that is positioned by a distance upward from an upper-side surface of the backward bent portion (12a1) and thus forms a gap (g); and a fixation portion that is connected to the upper-side surface of the backward bent portion; a pair of hanger connection units arranged on both end portions of the front member, respectively, and connected to the hanger; a gap formation portion (115a, 115b, 115c) that is positioned by a distance upward from an upper-side surface of the backward bent portion (12a1) and thus forms a gap (g); and a fixation portion that is connected to the upper-side surface of the backward bent portion; wherein the top cover includes a backward protrusion portion that protrudes backward from a front lower end of the top cover and is inserted into the gap (g).