An LED lamp includes a heat sink including a supporting plate, a plurality of LEDs mounted on the supporting plate and a light-reflecting member mounted on a top face of the supporting plate. The LEDs includes a plurality of first LEDs disposed on a bottom face of the supporting plate and a plurality of second LEDs disposed on the top face of the supporting plate and surrounding the light-reflecting member. The light-reflecting member defines a plurality of concave portions recessed inwardly from an outer face thereof. The second LEDs are located corresponding to the concave portions, respectively, whereby light generated from the second LEDs is reflected by the light-reflecting member towards a lateral side of the LED lamp.