Board carrier, component mounter, and method for carrying board in component mounting

A component-mounted substrate moved to a specified substrate position by a substrate holding-and-moving device is delivered from a top of the substrate holding-and-moving device to a substrate discharge holder, and then while the substrate discharge holder is not moved, the substrate holding-and-moving device is moved to another substrate position, where a new substrate is received. Consequently, a later-executed movement operation for moving the new substrate to a substrate mounting region by the substrate holding-and-moving device, and a transfer operation for transferring the component-mounted substrate to an unloader unit by the substrate discharge holder, may be performed in parallel with each other without being influenced by each other's operation.