A spherical surface link mechanism (100, 200, 300) comprising: a proximal end link hub; a distal end link hub; a plurality of links; a plurality of intermediate link hubs; and a shaft member, wherein each of the plurality of links includes a first end link member, a second end link member, and an intermediate link member, the first end link member is coupled, at one end, to the proximal end link hub to be rotatable about a first rotation axis, the second end link member is coupled, at one end, to the distal end link hub to be rotatable about a second rotation axis, the intermediate link member is coupled, at one end, to another end of the first end link member to be rotatable about a third rotation axis and is coupled to, at another end, another end of the second end link member about a fourth rotation axis, a center axis of the proximal end link hub, the first rotation axis, and the third rotation axis cross at a first spherical surface link center point, a center axis of the distal end link hub, the second rotation axis, and the fourth rotation axis cross at a second spherical surface link center point, each of the plurality of intermediate link hubs is connected to the intermediate link member of each of the plurality of links, and the plurality of intermediate link hubs are coupled to one another by the shaft member ( (34, 33, 37, 38) to be rotatable about a fifth rotation axis that passes the first spherical surface link center point and the second spherical surface link center point, and characterised in that a through hole is formed in the shaft member so as for the through hole to pierce through the shaft member along the fifth rotation axis. a proximal end link hub; a distal end link hub; a plurality of links; a plurality of intermediate link hubs; and a shaft member, wherein each of the plurality of links includes a first end link member, a second end link member, and an intermediate link member, the first end link member is coupled, at one end, to the proximal end link hub to be rotatable about a first rotation axis, the second end link member is coupled, at one end, to the distal end link hub to be rotatable about a second rotation axis, the intermediate link member is coupled, at one end, to another end of the first end link member to be rotatable about a third rotation axis and is coupled to, at another end, another end of the second end link member about a fourth rotation axis, a center axis of the proximal end link hub, the first rotation axis, and the third rotation axis cross at a first spherical surface link center point, a center axis of the distal end link hub, the second rotation axis, and the fourth rotation axis cross at a second spherical surface link center point, each of the plurality of intermediate link hubs is connected to the intermediate link member of each of the plurality of links, and the plurality of intermediate link hubs are coupled to one another by the shaft member ( (34, 33, 37, 38) to be rotatable about a fifth rotation axis that passes the first spherical surface link center point and the second spherical surface link center point, and characterised in that a through hole is formed in the shaft member so as for the through hole to pierce through the shaft member along the fifth rotation axis.