To provide a caster device whose maintenance ability is improved.

A caster shaft 7 is installed to a car body side in such a way that a caster shaft C1 is nearly perpendicular to the car body, and the car body side attaching section 11 of an L-like arm section 8, is attached to the lower end section of the caster shaft C1 rotatably in relation to the caster shaft 7. The lower end section of the arm section 8 supports one end of an axle 9. With the axle 9 penetrating a wheel 10 at its center, the axle 9 is positioned in the axial direction so as to make the plane P passing through the width center of the wheel 10 align with the caster shaft C1.