A light emitting device including a first light emitting unit, a second light emitting unit, a heat dissipation substrate, a plurality of first bumps and a plurality of second bumps is provided. The heat dissipation substrate is disposed between the first light emitting unit and the second light emitting unit. The first bumps are connected between the first light emitting unit and the heat dissipation substrate. The second bumps are connected between the second light emitting unit and the heat dissipation substrate.