There is provided a mounting board manufacturing system including: a component placer including a placing head having a holding tool that holds a component and places the component on a board, and a placing head mover that moves the placing head to a target position for placing the component held by the holding tool at a component placement position of the board; an inspector that inspects a placement position of the component placed on the board by imaging the board on which the component is placed by the component placer; a correction value calculator that calculates a correction value for correcting the target position using an inspection result, and updates the correction value using a new inspection result when the new inspection result is obtained; a target position calculator that calculates the target position using the correction value; and a correction value changer that changes a latest correction value used immediately before stopping an operation of the component placer to a correction value different from the latest correction value when the operation is resumed after the component placer stops the operation and the component is to be placed by the component placer.