A parallel link mechanism comprising: a proximal end side link hub; a distal end side link hub; and three or more link mechanisms that connect the distal end side link hub to the proximal end side link hub in a position-changeable fashion, each of the link mechanisms including: a proximal side end link member, one end of the proximal side end link member being pivotably connected to the proximal end side link hub; a distal side end link member, one end of the distal side end link member being pivotably connected to the distal end side link hub; and an intermediate link member whose opposite ends being pivotably connected to the other ends of the proximal side end link member and the distal side end link member, respectively, and each of the link mechanisms having such a shape that a geometric model of the link mechanism represented by lines shows symmetry between a proximal end side portion thereof and a distal end side portion thereof with respect to an intermediate portion of the intermediate link member, wherein a revolute pair between the proximal end side link hub and the one end of the proximal side end link member, a revolute pair between the distal end side link hub and the one end of the distal side end link member, and revolute pairs between the other ends of the proximal side and distal side end link members (5, 6) and the opposite ends of the intermediate link each has a bearing (12, 24) interposed therein, characterized in that as each bearing (12, 24), a bearing (12, 24) that has a critical oscillation angle smaller than the maximum value in a possible range of a bending angle which is defined as an angle between a central axis of the proximal end side link hub and a central axis of the distal end side link hub is employed. a proximal end side link hub; a distal end side link hub; and three or more link mechanisms that connect the distal end side link hub to the proximal end side link hub in a position-changeable fashion, each of the link mechanisms including: a proximal side end link member, one end of the proximal side end link member being pivotably connected to the proximal end side link hub; a distal side end link member, one end of the distal side end link member being pivotably connected to the distal end side link hub; and an intermediate link member whose opposite ends being pivotably connected to the other ends of the proximal side end link member and the distal side end link member, respectively, and a proximal side end link member, one end of the proximal side end link member being pivotably connected to the proximal end side link hub; a distal side end link member, one end of the distal side end link member being pivotably connected to the distal end side link hub; and an intermediate link member whose opposite ends being pivotably connected to the other ends of the proximal side end link member and the distal side end link member, respectively, and each of the link mechanisms having such a shape that a geometric model of the link mechanism represented by lines shows symmetry between a proximal end side portion thereof and a distal end side portion thereof with respect to an intermediate portion of the intermediate link member, wherein a revolute pair between the proximal end side link hub and the one end of the proximal side end link member, a revolute pair between the distal end side link hub and the one end of the distal side end link member, and revolute pairs between the other ends of the proximal side and distal side end link members (5, 6) and the opposite ends of the intermediate link each has a bearing (12, 24) interposed therein,