A working apparatus comprising: a number n, where n is a natural number equal to 2 or greater, of work heads adapted to perform the same work; a stage adapted to retain a work object; a first-direction drive device adapted to move the stage and the number n of work heads relative to each other in a first direction; a second-direction drive device (7, 13) adapted to move the stage and the number n of work heads relative to each other in a second direction orthogonal to the first direction; a third-direction drive device adapted to move the stage and the number n of work heads relative to each other in a third direction orthogonal to both the first direction and the second direction; a work amount measurement device adapted to measure a work amount of each work head; and a control device adapted to control operations of the number n of work heads and the first- to third-direction drive device (6, 7, 13, 8), wherein the first-direction drive device comprises a number n of first-direction main drive devices (6a, 6b, 6c), and the first-direction main drive devices (6a, 6b, 6c) are adapted to enable the number n of work heads to be independently moved on the same linear path in the first direction, wherein the second-direction drive device (7, 13) includes a second-direction main drive device adapted to move the number n of work heads simultaneously in the second direction, and a number n-1 of second-direction auxiliary drive devices (13b, 13c) adapted to move n-1 work heads among the number n of work heads independently in the second direction, wherein one of the work heads serves as a reference work head, and the reference work head is not disposed on a second-direction auxiliary drive device (13b, 13c), wherein the work heads that do not serve as a reference work head are disposed on the respective second-direction auxiliary drive device (13b, 13c), wherein each second-direction auxiliary drive device (13b, 13c) is disposed on a lateral surface of the respective first-direction main drive device (6b, 6c) corresponding to the work heads that do not serve as a reference work head, wherein the number n of first-direction main drive devices (6a, 6b, 6c) are disposed on a lateral surface of a beam, wherein the beam is positioned above the second-direction main drive device so that the second-direction main drive device is constituted to move the first-direction main drive devices (6a, 6b, 6c) at the same time in the second direction, wherein the working apparatus is configured to calculate a corrected moving speed of the work heads based on their respective outputs, and wherein each second-direction auxiliary drive device (13b, 13c) is operated at a differential speed relative to the moving speed of the reference work head when the corrected moving speeds in the second direction are different among the work heads. a number n, where n is a natural number equal to 2 or greater, of work heads adapted to perform the same work; a stage adapted to retain a work object; a first-direction drive device adapted to move the stage and the number n of work heads relative to each other in a first direction; a second-direction drive device (7, 13) adapted to move the stage and the number n of work heads relative to each other in a second direction orthogonal to the first direction; a third-direction drive device adapted to move the stage and the number n of work heads relative to each other in a third direction orthogonal to both the first direction and the second direction; a work amount measurement device adapted to measure a work amount of each work head; and a control device adapted to control operations of the number n of work heads and the first- to third-direction drive device (6, 7, 13, 8), wherein the first-direction drive device comprises a number n of first-direction main drive devices (6a, 6b, 6c), and the first-direction main drive devices (6a, 6b, 6c) are adapted to enable the number n of work heads to be independently moved on the same linear path in the first direction, wherein the second-direction drive device (7, 13) includes a second-direction main drive device adapted to move the number n of work heads simultaneously in the second direction, and a number n-1 of second-direction auxiliary drive devices (13b, 13c) adapted to move n-1 work heads among the number n of work heads independently in the second direction, wherein one of the work heads serves as a reference work head, and the reference work head is not disposed on a second-direction auxiliary drive device (13b, 13c), wherein the work heads that do not serve as a reference work head are disposed on the respective second-direction auxiliary drive device (13b, 13c), wherein each second-direction auxiliary drive device (13b, 13c) is disposed on a lateral surface of the respective first-direction main drive device (6b, 6c) corresponding to the work heads that do not serve as a reference work head, wherein the number n of first-direction main drive devices (6a, 6b, 6c) are disposed on a lateral surface of a beam, wherein the beam is positioned above the second-direction main drive device so that the second-direction main drive device is constituted to move the first-direction main drive devices (6a, 6b, 6c) at the same time in the second direction, wherein the working apparatus is configured to calculate a corrected moving speed of the work heads based on their respective outputs, and wherein each second-direction auxiliary drive device (13b, 13c) is operated at a differential speed relative to the moving speed of the reference work head when the corrected moving speeds in the second direction are different among the work heads.