To facilitate the movement of a helicopter on the ground, by protruding plural wheels, provided for elevation on the front and the rear in respective skids, to the lower part than the lower surface of the skids by a jack after landing.

The upper part of a jack 3 and the hinge of a movable fitting base mount 2; out of the jack 3, the movable type fitting base mounts 2 of wheels 1, and the wheels 1, etc., housed in the casings 4 of skids 5; are fixed to the skids 5. When the jack 3 is extended, it is extended downward to rotate the base mount 2 around a fitting spindle, and the wheel 1 fitted to the base mount 2 is lowered to be protruded outside from the lower surface of the skids 5. The wheels 1 are housed in the skids 5 when a helicopter is flying, taking off, and landing, and the respective wheels are protruded outside of the lower surface of the skids 5 when moving on the ground; therefor the helicopter is supported by four wheels 1 to be made movable by only adding force.