Abstract: A hand operated orbital sander having a hand grip portion provided with a fluid supply inlet connected to a source of pressurized fluid and a fluid discharge; a base portion for mounting a sanding pad and having a chamber, a fluid inlet for directing fluid into the chamber and a fluid outlet for discharging fluid from the chamber; a resiliently deformable sleeve portion for connecting the base portion to depend from the hand grip portion and defining a conduit for placing the fluid outlet in flow communication with the fluid discharge; a fluid operated rotor rotatably supported by the base portion within the chamber and mounting an eccentric weight for imparting orbital movement to the base portion; and a flexible conduit for connecting the supply inlet to the fluid inlet to apply pressurized fluid to the rotor to effect rotation thereof.