A bookbinding apparatus for bookbinding a sheet by applying adhesive including, an adhesive tank for storing adhesive; first and second heaters for heating the adhesive; a first adhesive temperature sensor for detecting temperature of the adhesive at a first position; a second adhesive temperature sensor for detecting temperature of the adhesive at a second position; an agitation member for agitating the adhesive in the adhesive tank; and a control device, wherein the control device operates, the agitation member after the heaters are turned on, then turns off the second heater and continues to have the first heater on after the second heater has been turned off when the second adhesive temperature sensor detects that adhesive temperature has reached a first temperature that is higher than an application temperature, and then completes a warm-up when the first adhesive temperature sensor detects that adhesive temperature has reached the application temperature.