To provide a fitting for annexing a cross arm, which can be easily attached even when approaching a pin of a high-voltage insulator, attached to the cross arm, from below the cross arm, and which can prevent a bird from building a nest inside the cross arm.

A fitting for annexing a cross arm comprises a flat plate part 16 in which a latching hole 15 capable of being latched to a pin 5a of a high-voltage insulator 5 attached to an end of a cross arm 2 is formed, and a holding piece 17 that can be locked to the end of the cross arm 2 and that can be held by an instrument for an indirect operation. The flat plate part 16 and the holding piece 17 are connected together in such a manner as to be angle-adjustable on the axis along side edges close to each other. The holding piece 17 is formed in a shape in which its length is longer than an interval (vertical width) between a surface fitted with the high-voltage insulator 5 at the end of the cross arm 2 and a surface facing the surface.