The invention relates to a wearable sitting posture assisting device, comprising at least one body connection unit (10a, 12a 10b-d), the body connection unit (10a, 12a 10b-d) featuring at least one support element (14a-d) and at least one body part connector (16a-d) for connecting to at least one thigh (208a) and/or shank (212a) of a person (200a).It is proposed that the body part connector (16a-d) is movably mounted to the support element (14a-d).