Valve for a bathroom or kitchen hand shower comprising - a body of the valve; - an inlet for the water into the body of the valve; - at least one outlet (38, 39) for the water out of the body of the valve, - a closing body inside the body of the valve; - an actuation device for shifting the closing body along a first axis between at least one closing position of a fluid path between the inlet and one of said at least one outlet (38, 39) and an opening position of the fluid path between the inlet and said at least one of said at least one outlet (38, 39); - an actuator button outside the body of valve associated with the actuation device; the actuation device comprises a cam located in the body of the valve and a stepwise advancement mechanism located outside the body of the valve and operatively associated with the cam; the cam being associated with the closing body of the valve and the advancement mechanism advancing by one step upon each next shift of the actuator button from a release position to an actuation position, making the closing body move between the closing and opening positions, - an elastic return system is operative between the actuator button and the body of the valve and between the actuator button and the advancement mechanism, returning the actuator button from the actuation position to the release position and repositioning the advancement mechanism for a next step; wherein the advancement mechanism comprises at least one toothed wheel associated with the cam and rotatable around a second axis (X') which is parallel to said first axis and at least one rod for the functional interconnection between the actuator button and the toothed wheel; characterized in that the actuator button comprises a plate rotatably engaged at a first side under an outer surface of the body of the valve, and rotatable around a third axis (X") parallel to said first axis, said plate being rotatably engaged at a second other side with the at least one rod, said at least one rod having a shaped profile for contacting said at least one toothed wheel and being rotatable around a fourth axis (X'") which is movable and parallel to said third axis (X"). - a body of the valve; - an inlet for the water into the body of the valve; - at least one outlet (38, 39) for the water out of the body of the valve, - a closing body inside the body of the valve; - an actuation device for shifting the closing body along a first axis between at least one closing position of a fluid path between the inlet and one of said at least one outlet (38, 39) and an opening position of the fluid path between the inlet and said at least one of said at least one outlet (38, 39); - an actuator button outside the body of valve associated with the actuation device; the actuation device comprises a cam located in the body of the valve and a stepwise advancement mechanism located outside the body of the valve and operatively associated with the cam; the cam being associated with the closing body of the valve and the advancement mechanism advancing by one step upon each next shift of the actuator button from a release position to an actuation position, making the closing body move between the closing and opening positions, - an elastic return system is operative between the actuator button and the body of the valve and between the actuator button and the advancement mechanism, returning the actuator button from the actuation position to the release position and repositioning the advancement mechanism for a next step; - an elastic return system is operative between the actuator button and the body of the valve and between the actuator button and the advancement mechanism, returning the actuator button from the actuation position to the release position and repositioning the advancement mechanism for a next step; wherein the advancement mechanism comprises at least one toothed wheel associated with the cam and rotatable around a second axis (X') which is parallel to said first axis and at least one rod for the functional interconnection between the actuator button and the toothed wheel; characterized in that the actuator button comprises a plate rotatably engaged at a first side under an outer surface of the body of the valve, and rotatable around a third axis (X") parallel to said first axis, said plate being rotatably engaged at a second other side with the at least one rod, said at least one rod having a shaped profile for contacting said at least one toothed wheel and being rotatable around a fourth axis (X'") which is movable and parallel to said third axis (X").