Adjustment of a posture of a ball joint is facilitated. A support device includes a pan head unit, a ball joint having a first end to which the pan head unit is attached and a second end provided with a ball portion, a ball holder configured to selectively fix the ball portion, a ball fixing screw connected to the ball holder and configured to move the ball holder between a locked position at which the ball portion is fixed and an unlocked position at which the ball portion is freely rotatable, and an elastic member configured to urge the ball holder toward the ball portion. The ball holder and the ball fixing screw are connected to each other so as to be strokable with a predetermined stroke amount. The predetermined stroke amount is smaller than a movement amount of the ball fixing screw between a first position corresponding to the locked position and a second position corresponding to the unlocked position.