To simplify a structure and handling, and to press down even a facing remarkable in a recess/projection by uniform pressure.

An elastic push-contact body 8 is arranged on the tip surface of a man cage 5 installed on the tip of a boom 4 arranged in a ground excavating machine 1. The push-contact body 8 is composed of, for example, a soft elastic block (a soft elastic body) composed of rubber, sponge and polyurethane foam or a kneeling cushion-like thing by packing cotton in a flexible bag body such as rubberrized cloth or a composite elastic raw material by laying plural raw materials different in elasticity.