A connecting device for components of an item of furniture, comprising: - a first connecting member which is of generally cylindrical shape and provided with a main axis and which is capable of being received in a seat formed in a first component of the item of furniture with the ability to rotate about the main axis, - a second connecting member which is in the general form of a pin and extends along a longitudinal axis and a first end of which is capable of being engaged in a second component of the item of furniture, and an opposite second end of which is capable of engaging with the first connecting member, in which the first connecting member comprises an inner disc and an outer disc which are parallel and coaxial with each other and on each of which there are defined a first surface (20a, 21a) and a second surface (20b, 21b) which face respectively towards and away from the other of the discs, the inner and outer discs being joined together by a central pin extending along the main axis, there being provided on at least one of the inner and outer discs means for coupling the second end of the second connecting member in order to couple the second connecting member and drive it in a direction parallel with the longitudinal axis towards the central pin between the inner and outer discs as a result of a rotation of the first connecting member about the main axis of rotation in order to clamp the first furniture component against the second furniture component, characterized in that the coupling means comprise a first projection rising from the first surface (20a, 21a) of at least one of the inner and outer discs, the first projection extending in a circumferential arc having a centre displaced with respect to the main axis of the first connecting member. - a first connecting member which is of generally cylindrical shape and provided with a main axis and which is capable of being received in a seat formed in a first component of the item of furniture with the ability to rotate about the main axis, - a second connecting member which is in the general form of a pin and extends along a longitudinal axis and a first end of which is capable of being engaged in a second component of the item of furniture, and an opposite second end of which is capable of engaging with the first connecting member, in which the first connecting member comprises an inner disc and an outer disc which are parallel and coaxial with each other and on each of which there are defined a first surface (20a, 21a) and a second surface (20b, 21b) which face respectively towards and away from the other of the discs, the inner and outer discs being joined together by a central pin extending along the main axis, there being provided on at least one of the inner and outer discs means for coupling the second end of the second connecting member in order to couple the second connecting member and drive it in a direction parallel with the longitudinal axis towards the central pin between the inner and outer discs as a result of a rotation of the first connecting member about the main axis of rotation in order to clamp the first furniture component against the second furniture component, characterized in that the coupling means comprise a first projection rising from the first surface (20a, 21a) of at least one of the inner and outer discs, the first projection extending in a circumferential arc having a centre displaced with respect to the main axis of the first connecting member.