To provide an improved modular rolling mill capable of producing articles of various lengths in spite of a single rolling mill and also, easily performing rolling under heat treatment at a low temperature between rolling units.

Rolling units 10a, 10b and 10c, especially, work rolls 14 and 16 of the rolling units progressively reduce the cross sectional area of an article received along a mill path line P, and send out the article. Gear units 46a, 46b and 46c connected to each rolling unit at the corresponding stage are mechanically connected to a common driven line shaft 36 via main bevel gear pair 44. The ratio of the first bevel gear set 44 at each stage is established to progressively increase from the first to the last stage to accommodate the increase in speed of the article accompanying the passage through rolling units. The gear ratio of a sub bevel gear set 54 of a last gear unit 46c is established to be the same as the gear ratio of the main bevel gear set 44 of an intermediate gear unit 46b. The line shaft 36 is mechanically connected to the last gear unit 46c by the one or the other of the bevel gear sets 44 and 54.