A caster indicator displays the state of casters provided on an ultrasonic diagnostic apparatus or a medical bed. The caster indicator includes a position sensing unit sensing the position of levers determining the state of casters, and a display unit displaying the state of the casters according to the position of the levers. With the caster indicator, a user easily confirms the state of the casters, even if a medical electronic apparatus, such as the ultrasonic diagnostic apparatus or the medical bed, is located at a dark place.