A bookbinding machine having: a path of conveying a book block to be bound; a nozzle type adhesive application mechanism arranged under the path of conveying a book block to be bound; and at least one clamper adapted to grip the book block while keeping the book block in a standing state and convey the book block along the path, wherein the nozzle type adhesive application mechanism comprises: a spray nozzle directed toward the path; an adhesive supply source; an adhesive supply pipe for supplying adhesive from the adhesive supply source to the spray nozzle; a pump connected to the adhesive supply pipe, whereby, in use, the adhesive sprayed from the spray nozzle is applied to a spine of the book block during the conveyance of the book block along the path, characterized in that the bookbinding machine further comprises: a pump rotational speed setting section being adapted to calculate a rotational speed coefficient depending on both of a thickness of the book block and a set value of a conveying speed of the at least one clamper by use of first and second functions, the rotational speed coefficient representing the percent change of a rotational speed of the pump relative to the reference rotational speed of the pump, the first function defining a relationship between the thickness of the book block and the rotational speed coefficient, the second function defining a relationship between the conveying speed of the at least one clamper and the rotational speed coefficient, the pump rotational speed setting section further being adapted to calculate a set value of the rotational speed of the pump based on both the rotational speed coefficient and the reference rotational speed of the pump, and being adapted to perform initial setting of the rotational speed of the pump according to the set value of the rotational speed. a path of conveying a book block to be bound; a nozzle type adhesive application mechanism arranged under the path of conveying a book block to be bound; and at least one clamper adapted to grip the book block while keeping the book block in a standing state and convey the book block along the path, wherein the nozzle type adhesive application mechanism comprises: a spray nozzle directed toward the path; an adhesive supply source; an adhesive supply pipe for supplying adhesive from the adhesive supply source to the spray nozzle; a pump connected to the adhesive supply pipe, whereby, in use, the adhesive sprayed from the spray nozzle is applied to a spine of the book block during the conveyance of the book block along the path, characterized in that a spray nozzle directed toward the path; an adhesive supply source; an adhesive supply pipe for supplying adhesive from the adhesive supply source to the spray nozzle; a pump connected to the adhesive supply pipe, whereby, in use, the adhesive sprayed from the spray nozzle is applied to a spine of the book block during the conveyance of the book block along the path, characterized in that the bookbinding machine further comprises: a pump rotational speed setting section being adapted to calculate a rotational speed coefficient depending on both of a thickness of the book block and a set value of a conveying speed of the at least one clamper by use of first and second functions, the rotational speed coefficient representing the percent change of a rotational speed of the pump relative to the reference rotational speed of the pump, the first function defining a relationship between the thickness of the book block and the rotational speed coefficient, the second function defining a relationship between the conveying speed of the at least one clamper and the rotational speed coefficient, the pump rotational speed setting section further being adapted to calculate a set value of the rotational speed of the pump based on both the rotational speed coefficient and the reference rotational speed of the pump, and being adapted to perform initial setting of the rotational speed of the pump according to the set value of the rotational speed. a pump rotational speed setting section being adapted to calculate a rotational speed coefficient depending on both of a thickness of the book block and a set value of a conveying speed of the at least one clamper by use of first and second functions, the rotational speed coefficient representing the percent change of a rotational speed of the pump relative to the reference rotational speed of the pump, the first function defining a relationship between the thickness of the book block and the rotational speed coefficient, the second function defining a relationship between the conveying speed of the at least one clamper and the rotational speed coefficient, the pump rotational speed setting section further being adapted to calculate a set value of the rotational speed of the pump based on both the rotational speed coefficient and the reference rotational speed of the pump, and being adapted to perform initial setting of the rotational speed of the pump according to the set value of the rotational speed.