Reciprocating shower device for human usage when showering

A shower device comprising a housing having a slit longitudinally elongated substantially in a central part of said housing, a guide rail provided inside said housing to be disposed along said elongated slit, a slider means supporting a shower nozzle and displaceable for reciprocation along said guide rail, first water passage means for supplying water to said shower nozzle, and a driving means for hydraulically reciprocating said slider means for travel along said guide rail to apply said water ejected from said shower nozzle to and along a user's body, wherein said driving means comprises a drive element operably connected to said slider means so that displacement of said drive element produces travel of said slider means, a change-over valve connected to a source of pressurized water a pair of conduits each communicating with said drive element and said change-over valve for conducting water to and from said drive element for displacing said drive element, said change-over valve supplying pressurized water alternately to said conduits so that each of said conduits alternately defines a supply conduit conducting pressurized water to said drive element and a discharge conduit conducting discharge water away from said drive element, whereby the direction of displacement of said drive element is periodically reversed, said drive means arranged to keep said discharge water isolated from water in said first water passage means so that the pressure of water ejected from said shower nozzle is independent of water and pressure in said discharge conduit.