A roller module for an input module includes a roller base, a roller element and an adjusting element. The roller element is pivotally coupled to the roller base. Moreover, at least one discontinuous protrusion structure is circumferentially arranged a bottom surface of a concave region of the roller element. A contacting part of the adjusting element is contacted with the at least one discontinuous protrusion structure. Consequently, a rotation of the roller element results in a tactile feel.