A component mounter for mounting multiple components in a stack on a board, the component mounter comprising: a head including a holding member configured to hold a component; a raising and lowering device (50, 55) configured to raise and lower the holding member; a raising and lowering position detector (53, 58) configured to detect a raising and lowering position of the holding member; characterized in that: a contact detector configured to detect that the component held by the holding member has contacted a mounting target object; and a controller configured to acquire, when a former component among the multiple components to be stacked on the board has been mounted and contact of the former component to a mounting target object is detected by the contact detector, position information of the former component identified based on the raising and lowering position of the holding member detected by the raising and lowering position detector (53, 58), and configured to control the head and the raising and lowering device so as to, when mounting a latter component among the multiple components to be stacked on the board, mount the latter component on the former component based on the acquired position information of the former component. a head including a holding member configured to hold a component; a raising and lowering device (50, 55) configured to raise and lower the holding member; a raising and lowering position detector (53, 58) configured to detect a raising and lowering position of the holding member; characterized in that: a contact detector configured to detect that the component held by the holding member has contacted a mounting target object; and a controller configured to acquire, when a former component among the multiple components to be stacked on the board has been mounted and contact of the former component to a mounting target object is detected by the contact detector, position information of the former component identified based on the raising and lowering position of the holding member detected by the raising and lowering position detector (53, 58), and configured to control the head and the raising and lowering device so as to, when mounting a latter component among the multiple components to be stacked on the board, mount the latter component on the former component based on the acquired position information of the former component. a contact detector configured to detect that the component held by the holding member has contacted a mounting target object; and a controller configured to acquire, when a former component among the multiple components to be stacked on the board has been mounted and contact of the former component to a mounting target object is detected by the contact detector, position information of the former component identified based on the raising and lowering position of the holding member detected by the raising and lowering position detector (53, 58), and configured to control the head and the raising and lowering device so as to, when mounting a latter component among the multiple components to be stacked on the board, mount the latter component on the former component based on the acquired position information of the former component.