A wearable sitting posture assisting device is proposed, comprising at least one leg unit (1 02a) featuring at least one knee joint (131 a) and featuring at least one locking unit (138a) for the knee joint (131 a)； comprising at least one second leg unit (1 04a) featuring at least one second knee joint (10a) and featuring at least one second locking unit (12a)； and comprising at least one actuation unit (14a； 14f； 14g； 14h； 14i； 14j) featuring at least one manually operable actuation element (16a； 16g； 16h； 16i； 16j) for mechanically controlling the locking unit (138a) and/or the second locking unit (12a).
