A filling apparatus (1; 2) for filling containers with fluid products, comprising: - advancing means of said containers along a filling path able to drive said incoming empty containers and said outgoing containers filled with a dose of said fluid product; - a filling area (1'; 2') arranged along said filling path into which said empty containers are filled with said dose of said fluid product, said filling area is provided with safety barriers for the operator and able to prevent access to said filling area (1'; 2') when the filling said containers is performed; - a first filling unit (111; 122) for filling said containers and provided with a plurality of filling members (1111; 1211) able to feed said dose of said fluid product into corresponding containers; - a second filling unit (211; 222) for filling said containers and provided with a plurality of filling members (1122, 1222) able to feed said dose of said fluid product into corresponding containers; - a rest area (1"; 2") arranged outside of said filling path and of said filling area (1'; 2'), said rest area (1"; 2") is accessible to said operator without interrupting the filling of said containers; and - actuating means adapted to reciprocally drive said first (111; 122) and said second (211; 222) filling unit from an operating condition to a rest condition; wherein said first (111; 122) and second (211; 222) filling unit are able to feed said doses of fluid product along said filling path in said filling area (10'; 20'); wherein in said operating condition one of said first (111; 122) and said second (211; 222) filling unit is arranged in said filling area (1'; 2') and able to be in fluid communication with said containers to be filled; and wherein in said rest condition the other between said first (111; 122) and second (211; 222) filling unit is arranged in said rest area (1"; 2") accessible to said operator without interrupting the filling of said containers in said filling area; said apparatus (1; 2) is characterized in that: said actuating means comprise a support structure rotatable about a vertical axis of rotation; said first (111; 122) and second (211; 222) filling unit are arranged on said support structure so that the movement between said operating position and said rest position is determined by the rotation of said support structure; said support structure comprises a partition wall between said rest and said filling areas; and said first (111; 122) and said second (211; 222) filling unit are arranged on opposing surfaces of said partition wall. - advancing means of said containers along a filling path able to drive said incoming empty containers and said outgoing containers filled with a dose of said fluid product; - a filling area (1'; 2') arranged along said filling path into which said empty containers are filled with said dose of said fluid product, said filling area is provided with safety barriers for the operator and able to prevent access to said filling area (1'; 2') when the filling said containers is performed; - a first filling unit (111; 122) for filling said containers and provided with a plurality of filling members (1111; 1211) able to feed said dose of said fluid product into corresponding containers; - a second filling unit (211; 222) for filling said containers and provided with a plurality of filling members (1122, 1222) able to feed said dose of said fluid product into corresponding containers; - a rest area (1"; 2") arranged outside of said filling path and of said filling area (1'; 2'), said rest area (1"; 2") is accessible to said operator without interrupting the filling of said containers; and - actuating means adapted to reciprocally drive said first (111; 122) and said second (211; 222) filling unit from an operating condition to a rest condition; said actuating means comprise a support structure rotatable about a vertical axis of rotation; said first (111; 122) and second (211; 222) filling unit are arranged on said support structure so that the movement between said operating position and said rest position is determined by the rotation of said support structure; said support structure comprises a partition wall between said rest and said filling areas; and said first (111; 122) and said second (211; 222) filling unit are arranged on opposing surfaces of said partition wall.