PROBLEM TO BE SOLVED: To provide a robot device capable of adsorbing a negative pressure on the surface of an object and self-propelled in both the Y-axis direction and the X-axis direction. A robot apparatus includes four suction cup units, a Y-axis actuator, and an X-axis actuator, and a planar shape of the suction cup is formed by dividing one square into four quadrangles having the same shape. And a square with two right-angled parts on the diagonal, and one right-angled part of the two right-angled parts constitutes one right-angled part of the four right-angled parts of the square. , The two sides forming the right angle of the sucker overlap the two sides forming the right angle of the square, and the two sides forming the other right angle of the suction cup are the two sides forming the right angle of the square, One side intersects with an acute angle and the other side intersects with an obtuse angle. [Selection diagram] Fig. 10
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