A bookbinding apparatus includes: a replenishing device having a pellet storing section that stores pellets of adhesive and a replenishing member that takes out the pellets in a countable manner from the pellet storing section; an adhesive reservoir that melts the pellets replenished from the replenishing member and stores the molten adhesive liquid; a coating device having a coating member that coats the adhesive scooped up from the adhesive liquid; a replenishment sensor that detects the number of pellets replenished to the adhesive reservoir; and a controller that controls the replenishing member based on an output of the replenishment sensor.