A multibeam laser apparatus and an image forming device using the same. The multibeam laser beam apparatus includes a common electrode unit, a plurality of light source units to emit light using the common electrode unit, and an isolating unit to interconnect the common electrode unit and the plurality of light source units. With such configuration for example, the laser apparatus can reduce distances between the respective light source units and the number of the electrodes, and thus reduce the number of wires and legs to produce a compact chip.