A head nozzle unit includes a pair of motion guides located parallel to each other, a pair of movable blocks disposed on the pair of motion guides and movable independently of each other, a guide member transversely connected to the pair of motion guides via the pair of movable blocks, a pair of head nozzle parts disposed on opposite lateral surfaces of the guide member, the pair of head nozzle parts movable independently of each other and operable to pick up and mount electronic parts, and a driver that moves the pair of movable blocks in cooperation with one another and that moves the pair of head nozzle parts in predetermined directions. Further, an apparatus and method for mounting electronic parts includes the head nozzle unit. The pair of head nozzle parts alternately and sequentially performs a series of mounting processes of picking up the electronic parts and mounting the picked up electronic parts.