Abstract: The inclination adjusting arrangement is applied to a keyboard having a base structure in which a plurality of keys is mounted. The keyboard is provided in its lower portion with fixed front support feet and rear support feet. The rear feet can project by varying amounts from the bottom of the base structure in such a way that the angle of inclination of the plane of the keys is variable with respect to the desk top. For the purposes of adjusting the degree of projection, the rear feet are pivoted and movable along their own axis by means of a slot which co-operates with a fixed pivot pin on the base structure. Each rear foot comprises a positioning tooth which is disposed opposite a support surface and which is capable of selectively engaging with a seat of a series of seats of the base structure. Resilient means which co-operate with the pin hold the positioning tooth engaged with one of the seats.