In order to cause swinging members, which swing relative to a base member, to swing in response to a small force, while ensuring a large swing angle of the swinging members, a swinging mechanism (3) according to the present invention is provided with: a first swinging member (5) which is supported so as to be capable of swinging around a first swinging axis (A) a second swinging member (6) which is supported on the first swinging member so as to be capable of swinging around a second swinging axis (B) provided at an interval in a direction orthogonal to the first swinging axis a traction pulley (7) which is supported on the second swinging member so as to be capable of rotating around a rotational axis (C) provided at an interval in a direction orthogonal to the second swinging axis a fixed pulley (8) which is supported so as to be capable of rotating around the second swinging axis and a wire (9) which is wound around the fixed pulley and the traction pulley, and which, as a result of an applied traction force, generates tension in substantially the same direction on both sides of the traction pulley with the rotational axis therebetween. The traction pulley is provided in a position in which the resultant force of the tension of the wire acting on the rotational axis generates a moment which causes the second swinging member to swing.Afin damener des éléments oscillants, qui oscillent par rapport à un élément base, à pivoter en réponse à une petite force, tout en garantissant un grand angle doscillation des éléments oscillants, un mécanisme oscillant (3) selon la présente invention comprend : un premier élément oscillant (5) qui est supporté de manière à pouvoir osciller autour dun premier axe doscillation (A) un second élément oscillant (6) qui est supporté sur le premier élément oscillant de manière à pouvoir osciller autour dun second axe doscillation (B) disposé à un intervalle dans une direction orthogonale au premier axe doscillation une poulie de traction
