A finger exercising device for the training, warming up, and/or rehabilitation of muscles, tendons, and pulleys of a phalanx, comprising: a base, which defines the longitudinal direction, transverse direction, and sagittal direction orthogonal to one another and a front face perpendicular to the sagittal direction, and wherein the base includes at least one longitudinal guide extending in the longitudinal direction; a carpal support, associated with the base, to support the base of the palm of the hand where the carpal bones are located; at least one distal phalangeal support, associated with the base, defining concave distal phalangeal seating to support the ends of the fingers where the distal phalanges are located; the distal phalangeal support being guided by the at least one longitudinal guide allowing a relative sliding between the carpal support and the distal phalangeal support in the longitudinal direction along a travel distance between maximum and minimum extension positions; at least one elastic element configured to offer elastic resistance to the sliding, in the longitudinal direction, of the at least one distal phalangeal support; characterized in that the carpal support defines a concave carpal seating defined by a concavity formed between a sagittal carpal surface, mostly facing the sagittal direction, and a longitudinal carpal surface, mostly facing the longitudinal direction, the longitudinal carpal surface being closer to the distal phalangeal support than the sagittal carpal surface and being adjacent to the sagittal carpal surface, forcing an arched, semi-arched, or extended grip of a hand between the concave carpal seating and the concave distal phalangeal seating. a base, which defines the longitudinal direction, transverse direction, and sagittal direction orthogonal to one another and a front face perpendicular to the sagittal direction, and wherein the base includes at least one longitudinal guide extending in the longitudinal direction; a carpal support, associated with the base, to support the base of the palm of the hand where the carpal bones are located; at least one distal phalangeal support, associated with the base, defining concave distal phalangeal seating to support the ends of the fingers where the distal phalanges are located; the distal phalangeal support being guided by the at least one longitudinal guide allowing a relative sliding between the carpal support and the distal phalangeal support in the longitudinal direction along a travel distance between maximum and minimum extension positions; at least one elastic element configured to offer elastic resistance to the sliding, in the longitudinal direction, of the at least one distal phalangeal support; characterized in that the carpal support defines a concave carpal seating defined by a concavity formed between a sagittal carpal surface, mostly facing the sagittal direction, and a longitudinal carpal surface, mostly facing the longitudinal direction, the longitudinal carpal surface being closer to the distal phalangeal support than the sagittal carpal surface and being adjacent to the sagittal carpal surface, forcing an arched, semi-arched, or extended grip of a hand between the concave carpal seating and the concave distal phalangeal seating.