To provide a current collecting device of a welding torch in a welding robot capable of enhancing current collection capacity, and suppressing the size of a shape of the current collecting device accompanying enhancement of the current collection capacity.

The current collecting device has a conductive brush 72 which is slidably brought into contact with a slip ring 50 and rotatably arranged with respect to the slip ring 50 around the axial center of the slip ring 50. The surface of the slip ring 50 which is slidably brought into contact with the conductive brush 72 is formed on a convex spherical surface 58, and the surface of the conductive brush 72 which is slidably brought into contact with the slip ring 50 is formed in a concave spherical surface 73 slidably in contact with the convex spherical surface 58. When the conductive brush 72 is rotated with respect to the slip ring 50 around the axial center of the slip ring 50, the concave spherical surface 73 of the conductive brush 72 is excellently and slidably brought into contact with the convex spherical surface 58 of the slip ring 50.