Abstract: Disclosed is a data input keyboard comprising a plurality of keys which are arranged on a panel in the form of a matrix of "m" lines, "n" columns and each of the keys being provided with a reset member and a pusher coupled to a contact pair; a switch means provided with a plurality of contact pairs; and a rotation transfer mechanism incorporating an input shaft with a rotation member and "m" output shafts and mechanically coupled to the contact pairs of the switch means. A body of the contact pairs of all the keys defines an accurate channel of forming the codes of the characters assigned by the keyboard and a body of the contact pairs of the switch means defines a rough channel of forming the aforesaid codes. Each of the keys has the shape of a cylinder with faces on the peripheral surface thereof carrying the inscriptions of the characters, and is made rotatable around the axis of the cylinder.