To provide a double-side dump bucket apparatus which facilitates switching of side dumping by using two dump cylinders.

According to the double-side dump bucket apparatus, a laterally extending rear carrier member 3 is arranged at the tip of a boom 2 as viewed in a plan view, and an end 5a of a front carrier member 5 is rotatably linked to an end of the rear carrier member 3. Then, a bucket member 7 is arranged in front of the front carrier member 5, and a portion of the bucket member 7, corresponding to the other end 5b of the front carrier member 5 is rotatably linked to the other end 5b. Further, a first dump cylinder 8 is arranged between the front carrier member 5 and the rear carrier member 3, and a second dump cylinder 9 is arranged between the front carrier member 5 and the bucket member 7, on one side of the first dump cylinder 8 closer to the other end 5b of the front carrier member 5. Thus, when one of the first and second dump cylinders 8, 9 is operated, the other dump cylinder is inhibited from operating by controlling a dump control circuit.