Braking device for the braked movement of parts of furniture or of parts of furniture accessories, wherein said parts are movable with respect to each other, wherein said braking device comprises: - a first component and a second component, which are mounted inside one another in a movable manner with respect to each other around a common rotation axis, - a viscous medium interposed between said first component and said second component, - an actuation element, which is adapted to be directly or indirectly actuated by one of said parts of furniture or of said parts of furniture accessories and which is integrally coupled in rotation to said first component at least in the rotation direction of said first component with respect to said second component, rotation direction that has to be of braked movement, - a containment body that is fixable to the other one of said parts of furniture or of said parts of furniture accessories and wherein a housing seat is obtained in which the assembly comprising at least said second component and said first component is housed, wherein - said first component consists of a hollow cylindrical element and in that said second component consists of an annular element that is mounted on the outer lateral surface of said hollow cylindrical element in a coaxial manner thereto, - said first component and said second component comprise each a respective surface of mutual coupling (11a, 12a), characterized in that, - said second component being elastically yielding, being made of an elastomer of the type of a thermoplastic elastomer or a nitrile rubber, being held tight on said first component and being directly or indirectly coupled to said housing seat in a fixed manner in rotation with respect to said rotation axis, - when the second component is mounted on said first component and tightened thereon, their mutual coupling surfaces (11a, 12a) are facing substantially in mutual contact with interposition of the viscous medium. - a first component and a second component, which are mounted inside one another in a movable manner with respect to each other around a common rotation axis, - a viscous medium interposed between said first component and said second component, - an actuation element, which is adapted to be directly or indirectly actuated by one of said parts of furniture or of said parts of furniture accessories and which is integrally coupled in rotation to said first component at least in the rotation direction of said first component with respect to said second component, rotation direction that has to be of braked movement, - a containment body that is fixable to the other one of said parts of furniture or of said parts of furniture accessories and wherein a housing seat is obtained in which the assembly comprising at least said second component and said first component is housed, wherein - said first component consists of a hollow cylindrical element and in that said second component consists of an annular element that is mounted on the outer lateral surface of said hollow cylindrical element in a coaxial manner thereto, - said first component and said second component comprise each a respective surface of mutual coupling (11a, 12a), - said second component being elastically yielding, being made of an elastomer of the type of a thermoplastic elastomer or a nitrile rubber, being held tight on said first component and being directly or indirectly coupled to said housing seat in a fixed manner in rotation with respect to said rotation axis, - when the second component is mounted on said first component and tightened thereon, their mutual coupling surfaces (11a, 12a) are facing substantially in mutual contact with interposition of the viscous medium.