A mouse having a replaceable palm rest and a replaceable finger rest is provided. The mouse includes a mouse body, the replaceable finger rest, and the replaceable palm rest. The mouse body has two side portions opposite to each other and a rear side portion located between the two side portions. The replaceable finger rest is replaceably coupled to the side portions of the mouse body by magnetic attraction. The replaceable palm rest is replaceably coupled to the rear side portion of the mouse body by magnetic attraction. The replaceable palm rest presses downwardly against the replaceable finger rest when the replaceable palm rest is downwardly coupled to the rear side portion of the mouse body.