To provide a high altitude demolition machine which achieves compactification and reduction of the number of components in the vicinity of a crusher.

A high altitude demolition machine includes a crusher 30 which is rotatably mounted to the tip of an arm 27, a crusher rotating cylinder 34 which rotates the crusher 30 relative to the arm 27, and a transmission mechanism 36A which converts a displacement of the crusher rotating cylinder 34 into a rotational displacement of the crusher 30. The crusher rotating cylinder 34 is disposed to the undersurface 27b of the arm 27.