A joystick used in a motion apparatus, for example, an exerciser or game machine, is disclosed to include a base fixedly fastened to the body of the motion apparatus, a motion member fixedly fastened to the operating member of the motion apparatus for biasing with the operating member by the user, elastomeric members connected between the base and the motion member, and a control member coupled to the motion member and movable relative to the motion member to lock the motion member to the base or to adjust the maximum biasing angle allowable for the motion member and the operating member.