A device (10) for stressing and training the joints and muscles of the hand, wrist and forearm, usable by an individual in order to develop each single muscular group involved in the movement of each finger of the hand, comprising a horizontal support plane or base (11) to which a vertical column (16) is associated and means suitable for allowing the movement of one or more fingers (15) of the hand (14) either at the same time or in an alternate way and according to a plane both horizontal and vertical against a resistance, in which a support element or block (12) for the metacarpus placed onto said plane (11) is provided.