An upper limb stabilizing apparatus includes: an arm resting portion where an arm is rested; an arm fixing portion where the rested arm is fixed; a hand resting portion connected to the arm resting portion and where a hand is rested; a hand fixing portion where the rested hand is fixed; and a Velcro portion arranged at the arm fixing portion and the hand fixing portion to attach or detach the arm fixing portion and the arm resting portion, and the hand fixing portion and the hand resting portion, respectively, to or from each other.