A hinge assembly comprising: a hinge cup having a first side wall, a second side wall, a bottom wall which is connected between the first and second side walls (26a, 26b), a front wall connected between two respective front ends of the first and second side walls (26a, 26b), and a rear wall connected between two respective rear ends of the first and second side walls (26a, 26b), a receiving space being defined by the first and second side walls (26a, 26b), the bottom wall, the front wall and the rear wall, the bottom wall of the receiving space having a first lug, a second lug and at least one first engaging part; an arm pivotably connected between the first and second side walls (26a, 26b) of the hinge cup, the arm located adjacent to the front wall of the hinge cup; an installation member connected to the arm and installed on a piece of furniture; a damping device to damp the closing of the hinge assembly located in the receiving space of the hinge cup and having a damping member, a slide and a housing, the damping member having a piston rod which is connected to the slide, the slide having at least one wing which is located corresponding to one of the first and second lugs (42a, 42b), the housing located in the receiving space and the damping member being accommodated in the housing, the housing having a room, an opening communicating with the room, and at least one second engaging part, the damping member extending through the room and the opening, the second engaging part engaged with the first engaging part on the bottom wall of the hinge cup; a first resilient member connected between the first lug and the first side wall so as to provide a force to the arm; a second resilient member connected between the second lug and the second side wall so as to provide a force to the arm; a first pin which is a U-shaped pin having two ends which respectively connect the arm and the first resilient member to the hinge cup; a second pin connecting the second resilient member to the hinge cup; when the arm is located at an open position relative to the hinge cup, the at least one wing of the slide contacts one of the first and second lugs (42a, 42b), and when the arm is moved toward a closed position relative to the hinge cup, the arm pushes the slide which moves the piston rod, the at least one wing of the slide is separated from one of the first and second lugs (42a, 42b). a hinge cup having a first side wall, a second side wall, a bottom wall which is connected between the first and second side walls (26a, 26b), a front wall connected between two respective front ends of the first and second side walls (26a, 26b), and a rear wall connected between two respective rear ends of the first and second side walls (26a, 26b), a receiving space being defined by the first and second side walls (26a, 26b), the bottom wall, the front wall and the rear wall, the bottom wall of the receiving space having a first lug, a second lug and at least one first engaging part; an arm pivotably connected between the first and second side walls (26a, 26b) of the hinge cup, the arm located adjacent to the front wall of the hinge cup; an installation member connected to the arm and installed on a piece of furniture; a damping device to damp the closing of the hinge assembly located in the receiving space of the hinge cup and having a damping member, a slide and a housing, the damping member having a piston rod which is connected to the slide, the slide having at least one wing which is located corresponding to one of the first and second lugs (42a, 42b), the housing located in the receiving space and the damping member being accommodated in the housing, the housing having a room, an opening communicating with the room, and at least one second engaging part, the damping member extending through the room and the opening, the second engaging part engaged with the first engaging part on the bottom wall of the hinge cup; a first resilient member connected between the first lug and the first side wall so as to provide a force to the arm; a second resilient member connected between the second lug and the second side wall so as to provide a force to the arm; a first pin which is a U-shaped pin having two ends which respectively connect the arm and the first resilient member to the hinge cup; a second pin connecting the second resilient member to the hinge cup; when the arm is located at an open position relative to the hinge cup, the at least one wing of the slide contacts one of the first and second lugs (42a, 42b), and when the arm is moved toward a closed position relative to the hinge cup, the arm pushes the slide which moves the piston rod, the at least one wing of the slide is separated from one of the first and second lugs (42a, 42b).