A hand orthosis for bending and/or stretching at least one finger of a patient's hand, comprising a force-introducing device fastened to a splint, which is coupled with at least one finger segment paired with the finger of the patient's hand, wherein the at least one finger segment comprises a plurality of modular members interconnected in an articulated manner. The modular members each have at least one bayonet link on a first front side and at least one bayonet hook, corresponding to the bayonet link, on a second front side for the formation of a bayonet connection between adjacent modular members providing a bayonet joint. In addition, the invention relates to a modular member for using in a hand orthosis and a method of producing a hand orthosis.
