A board work machine comprising: a head configured to mount a component; multiple nozzle holders provided on the head; a suction nozzle held onto each of the multiple nozzle holders to pick up a component; multiple lifting and lowering sections configured to individually lift and lower the corresponding nozzle holders provided on the head; and a control section configured to control which lifting and lowering section of the multiple lifting and lowering sections is to be used to lower the nozzle holder when a component picked up by the suction nozzle is released in a predetermined position on a board to be mounted on the board, characterized by a first determination section configured to determine whether the multiple lifting and lowering sections are in a state where the multiple lifting and lowering sections can individually be lowered properly; a notification section configured, when the first determination section determines that the multiple lifting and lowering sections are in a state where the multiple lifting and lowering sections cannot be lowered properly, to notify that the multiple lifting and lowering sections are in the state where the multiple lifting and lowering sections cannot be lowered properly; and a reception section configured to receive an input of an operation state after the state of the multiple lifting and lowering sections is notified of by the notification section, wherein the control section is configured to execute: a first determination process of determining, for each component, whether the nozzle holder is to be lowered by a pre-assigned lifting and lowering section of the multiple lifting and lowering sections based on the operation state; and a first lowering process of lowering the nozzle holder by any one of the multiple lifting and lowering sections that differs from the pre-assigned lifting and lowering section when determining that the nozzle holder is not to be lowered by the pre-assigned lifting and lowering section in the first determination process. a head configured to mount a component; multiple nozzle holders provided on the head; a suction nozzle held onto each of the multiple nozzle holders to pick up a component; multiple lifting and lowering sections configured to individually lift and lower the corresponding nozzle holders provided on the head; and a control section configured to control which lifting and lowering section of the multiple lifting and lowering sections is to be used to lower the nozzle holder when a component picked up by the suction nozzle is released in a predetermined position on a board to be mounted on the board, characterized by a first determination section configured to determine whether the multiple lifting and lowering sections are in a state where the multiple lifting and lowering sections can individually be lowered properly; a notification section configured, when the first determination section determines that the multiple lifting and lowering sections are in a state where the multiple lifting and lowering sections cannot be lowered properly, to notify that the multiple lifting and lowering sections are in the state where the multiple lifting and lowering sections cannot be lowered properly; and a reception section configured to receive an input of an operation state after the state of the multiple lifting and lowering sections is notified of by the notification section, wherein the control section is configured to execute: a first determination process of determining, for each component, whether the nozzle holder is to be lowered by a pre-assigned lifting and lowering section of the multiple lifting and lowering sections based on the operation state; and a first lowering process of lowering the nozzle holder by any one of the multiple lifting and lowering sections that differs from the pre-assigned lifting and lowering section when determining that the nozzle holder is not to be lowered by the pre-assigned lifting and lowering section in the first determination process. a first determination process of determining, for each component, whether the nozzle holder is to be lowered by a pre-assigned lifting and lowering section of the multiple lifting and lowering sections based on the operation state; and a first lowering process of lowering the nozzle holder by any one of the multiple lifting and lowering sections that differs from the pre-assigned lifting and lowering section when determining that the nozzle holder is not to be lowered by the pre-assigned lifting and lowering section in the first determination process.