A book block feed device that is configured to feed a book block to a bookbinding machine, comprising: an alignment unit and a press unit that are adjacently arranged in order along a conveying path of the book block (S) from an inlet to an outlet of the conveying path , a conveying mechanism that is configured to convey the book block (S) along the conveying path , a transfer mechanism disposed in the outlet of the conveying path , to feed the book block (S) pressed by the press unit to the bookbinding machine, the alignment unit including at least one vibrator configured to vibrate the book block (S), the press unit including a press surface that forms a part of a conveying surface of the conveying path , and a press plate that is configured to sandwich and press the book block (S) between the press plate and the press surface , wherein the conveying mechanism is configured to convey the book block (S) to the press unit , the press plate being configured to move from a standby position to a pressing position to remove air in the book block (S), the standby position being at a position away from the book block (S) disposed on the press surface , the pressing position being at a position to press the book block (S) toward the press surface , the conveying mechanism being configured to convey the book block (S) pressed by the press plate from the press unit to the transfer mechanism , characterised in that the transfer mechanism is disposed in the outlet of the conveying path, and in that the press plate is configured to move consecutively from the standby position, via the pressing position to the standby position again. an alignment unit and a press unit that are adjacently arranged in order along a conveying path of the book block (S) from an inlet to an outlet of the conveying path , a conveying mechanism that is configured to convey the book block (S) along the conveying path , a transfer mechanism disposed in the outlet of the conveying path , to feed the book block (S) pressed by the press unit to the bookbinding machine, the alignment unit including at least one vibrator configured to vibrate the book block (S), the press unit including a press surface that forms a part of a conveying surface of the conveying path , and a press plate that is configured to sandwich and press the book block (S) between the press plate and the press surface , wherein the conveying mechanism is configured to convey the book block (S) to the press unit , the press plate being configured to move from a standby position to a pressing position to remove air in the book block (S), the standby position being at a position away from the book block (S) disposed on the press surface , the pressing position being at a position to press the book block (S) toward the press surface , the conveying mechanism being configured to convey the book block (S) pressed by the press plate from the press unit to the transfer mechanism , characterised in that the transfer mechanism is disposed in the outlet of the conveying path, and in that the press plate is configured to move consecutively from the standby position, via the pressing position to the standby position again. <EOS>