Bending machine for metal sheets comprising: - a supporting frame provided with a base plate adapted to abut a supporting plane whereon said bending machine is placed; - punch means that include an upper crosspiece adapted to support at least one upper bending tools set, the upper bending tools being aligned along a bending direction parallel to said supporting plane; - die means that include a lower crosspiece adapted to support at least one lower bending tools set, the lower bending tools being aligned along said bending direction; - a tool magazine positioned in an internal compartment defined by said supporting frame and said punch means and die means and arranged to house bending tools (51, 61); - a replacing apparatus positioned in said internal compartment and arranged to take bending tools (51, 61) from said tool magazine and mount said bending tools (51, 61) on said punch means and/or said die means and vice versa; - said replacing apparatus comprising gripping means (21, 22) configured to simultaneously hook and move a bending tools whole set (50, 60); said bending machine being characterized in that: - said tool magazine comprises a plurality of supporting guides adjacent to, and supported by, said base plate, which are arranged parallel to said bending direction and adapted to slidably house each a respective bending tools set (50, 60), and a transfer carriage adjacent to, and supported by, said base plate, and adapted to house a bending tools set (50, 60), said transfer carriage being movable along a first driving direction, orthogonal to said bending direction and parallel to said supporting plane, between an exchange position, in which said transfer carriage is adjacent to said replacing apparatus in order to receive from, or provide to, said gripping means (21,22) a bending tools set (50, 60), and a plurality of loading positions in each of which said transfer carriage is almost aligned to a respective supporting guide in order to transfer to, or receive from, the supporting guide a bending tools set (50, 60), by moving the supporting guide along a movement direction parallel to said bending direction. - a supporting frame provided with a base plate adapted to abut a supporting plane whereon said bending machine is placed; - punch means that include an upper crosspiece adapted to support at least one upper bending tools set, the upper bending tools being aligned along a bending direction parallel to said supporting plane; - die means that include a lower crosspiece adapted to support at least one lower bending tools set, the lower bending tools being aligned along said bending direction; - a tool magazine positioned in an internal compartment defined by said supporting frame and said punch means and die means and arranged to house bending tools (51, 61); - a replacing apparatus positioned in said internal compartment and arranged to take bending tools (51, 61) from said tool magazine and mount said bending tools (51, 61) on said punch means and/or said die means and vice versa; - said replacing apparatus comprising gripping means (21, 22) configured to simultaneously hook and move a bending tools whole set (50, 60); said bending machine being characterized in that: - said tool magazine comprises a plurality of supporting guides adjacent to, and supported by, said base plate, which are arranged parallel to said bending direction and adapted to slidably house each a respective bending tools set (50, 60), and a transfer carriage adjacent to, and supported by, said base plate, and adapted to house a bending tools set (50, 60), said transfer carriage being movable along a first driving direction, orthogonal to said bending direction and parallel to said supporting plane, between an exchange position, in which said transfer carriage is adjacent to said replacing apparatus in order to receive from, or provide to, said gripping means (21,22) a bending tools set (50, 60), and a plurality of loading positions in each of which said transfer carriage is almost aligned to a respective supporting guide in order to transfer to, or receive from, the supporting guide a bending tools set (50, 60), by moving the supporting guide along a movement direction parallel to said bending direction.