Provided is an LED lightbulb. The LED lightbulb presents a hollow shape and comprises: a heatsink which has heat-dissipating parts constituting vanes having a plurality of curves following the outer surface; a substrate which is provided at the bottom edge of the heatsink and on which a plurality of LEDs are mounted; and a semi-spherical diffusing cap which is coupled to the lower edge of the heatsink, receives the transmitted light emanating from the LEDs and diffuses the same to the outside with differing amounts of diffusion depending on the position where the transmission was received. Consequently, the present invention can easily externally discharge the heat generated due to the light emission by the LEDs as it comprises heat-dissipating parts which maximise the surface area in contact with the air, and heat-generated convection currents are easily led outside and eliminated.
