The invention discloses an LED bulb. The LED bulb comprises a shell, a mask, an LED light source, a threaded lamp cap and a heat dissipation body; the shell comprises an upper mounting base, a lower mounting base and at least two connecting strips which are arranged in parallel, wherein the upper mounting base is connected to first ends of the connecting strips, the lower mounting base is connected to second ends of the connecting strips, a containing cavity which is partially opened towards the circumferential direction is formed among the upper mounting base, the lower mounting base and theconnecting strips, and the heat dissipation body is located in the containing cavity; the mask is installed at the top of the upper mounting base, the LED light source is located in the mask, and theLED light source is in contact with the heat dissipation body; and the threaded lamp cap is installed at the bottom of the lower mounting base. According to the LED bulb, heat generated by the LED light source is transmitted to the heat dissipation body, meanwhile, the containing cavity is non-closed so that isolation, between the heat dissipation body and external air, caused by the shell can bereduced, the heat reserved in the containing cavity is reduced, under the condition that the heat dissipation body can fully make contact with the outside air, the heat generated by the LED light source can be dissipated into external air efficiently, and therefore the heat dissipation effect is good.