The device (D) for removable fastening of seats (3) housing containers (C) to a metallic belt (1) includes first fastening means (10) made on the metallic belt (1) and aimed at being mutually coupled with second fastening means (34), made in the lower part of the seats (3) to position and lock the seats (3) to the belt (1). The device includes also supporting and sliding guides (4,5), facing each other and situated below and substantially orthogonal to eh metallic belt (1). The guides (4,5) are operated by operating means, between a first gripping configuration (P), in which they are vertical and constitute an abutment for the second fastening means (34), so as to define a fastening between the metallic belt (1) and the seats (3) for housing containers (C), and a second release configuration (R), in which at least one of the guides (4,5) is moved away from the second fastening means (34), so as to allow the seats (3) to be removed from the metallic belt (1).