A therapy device (20) comprises a first handle (28) for attaching a thumb of a hand, the first handle (28) being configured to guide the thumb for moving around a first centre (127), a second handle (30) for attached at least one of the remaining fingers of the hand, the second handle (28) being configured to guide at least one of the remaining fingers for moving around a second centre (131). One or more of the first handle (28) and the second handle (30) is connected to an actuation unit (24) for guiding opening or closing of the two handles (28, 30) around the two centres (127, 130) respectively.