A sitting motion assist system for assisting a sitting motion of a patient changing their posture from a standing posture to a sitting posture includes a care belt, a knee-bending adviser, and a pulling mechanism. The care belt can be put on the patient and includes a hold mechanism including a first holder capable of holding the neck or shoulder of the patient and a second holder capable of holding their lower back, and a coupler capable of being positioned on their chest and coupled to the hold mechanism. The knee-bending adviser advises the patient to perform a knee-bending motion. The pulling mechanism is coupled to the hold mechanism via the coupler and pulls the care belt downward and slightly forward relative to the patient after the advice by the knee-bending adviser, and thereafter pushes the care belt downward and slightly backward to assist the sitting motion.
