A liquid drop ejection head unit includes plural lines of plural nozzles formed on a nozzle plate, plural lines of plural drive elements that generate energy for ejecting liquid drop through the plural nozzles, and plural sheets of flexible printed circuit boards that input signals to the plural drive elements. The sheets of flexible printed circuit boards include input and output terminals for taking in and output a signal to one of the plural drive elements. A wiring board is provided to connect to the input terminals of the plural sheets of flexible printed circuit boards. The wiring board is arranged in parallel to the nozzle line within a width of nozzle plate. The plural sheets of the flexible printed boards are arranged opposing to each other via the wiring board. The input terminals are positioned not to face each other.