A furniture assembly, comprising a first furniture piece; a second furniture piece movable with respect to the first furniture piece; and a safety device, including: a first fitting and a second fitting wherein the first fitting is detachably coupled to the second furniture piece, and the second fitting is detachably coupled to the first furniture piece; wherein when the second fitting is at a stop position, the first fitting is blocked by the second fitting so that the second furniture piece is stopped from moving in a first direction with respect to the first furniture piece; wherein the first fitting includes a first stopping part and a second stopping part; a space is defined between the first stopping part and the second stopping part; and a portion of the second fitting protrudes into the space when the second fitting is at the stop position, so as to block one of the first stopping part and the second stopping part; wherein when the second furniture piece is at a closing position with respect to the first furniture piece, the second stopping part of the first fitting corresponds in position to a portion of the second fitting, so that the second fitting is kept in an initial position; wherein when the second furniture piece is moved in the first direction with respect to the first furniture piece due to a force applied on the furniture assembly and thereby departs from the closing position, the second stopping part of the first fitting does not correspond in position to the portion of the second fitting anymore, so that the second fitting moves from the initial position to a stop position responsive to the force, and that the portion of the second fitting protrudes into the space of the first fitting to block the first stopping part, thereby stopping the second furniture piece from moving in the first direction with respect to the first furniture piece; and wherein when the second furniture piece is moved in a second direction to a predetermined position with respect to the first furniture piece, the second stopping part contacts the portion of the second fitting and drives the second fitting from the stop position to return to the initial position. a first furniture piece; a second furniture piece movable with respect to the first furniture piece; and a safety device, including: a first fitting and a second fitting wherein the first fitting is detachably coupled to the second furniture piece, and the second fitting is detachably coupled to the first furniture piece; wherein when the second fitting is at a stop position, the first fitting is blocked by the second fitting so that the second furniture piece is stopped from moving in a first direction with respect to the first furniture piece; wherein the first fitting includes a first stopping part and a second stopping part; a space is defined between the first stopping part and the second stopping part; and a portion of the second fitting protrudes into the space when the second fitting is at the stop position, so as to block one of the first stopping part and the second stopping part; wherein when the second furniture piece is at a closing position with respect to the first furniture piece, the second stopping part of the first fitting corresponds in position to a portion of the second fitting, so that the second fitting is kept in an initial position; wherein when the second furniture piece is moved in the first direction with respect to the first furniture piece due to a force applied on the furniture assembly and thereby departs from the closing position, the second stopping part of the first fitting does not correspond in position to the portion of the second fitting anymore, so that the second fitting moves from the initial position to a stop position responsive to the force, and that the portion of the second fitting protrudes into the space of the first fitting to block the first stopping part, thereby stopping the second furniture piece from moving in the first direction with respect to the first furniture piece; and wherein when the second furniture piece is moved in a second direction to a predetermined position with respect to the first furniture piece, the second stopping part contacts the portion of the second fitting and drives the second fitting from the stop position to return to the initial position.