A LED light bulb includes a light bulb adapter; a housing fixed on the light bulb adapter and having an accommodating space, wherein the housing has at least a vent hole; a convective heat dissipation piece including a first heat dissipation part and a second heat dissipation part connected under the first heat dissipation part; a light-emitting module disposed on a top surface of the convective heat dissipation piece; and a light bulb cover disposed on the top surface of the convective heat dissipation piece and covering the light-emitting module.