An LED lamp includes a heat sink including a supporting plate, a light-reflecting member mounted on a bottom face of the supporting plate, and a plurality of LEDs disposed on the bottom face of the supporting plate. The light-reflecting member defines a plurality of concave portions recessed inwardly from an outer face thereof. The LEDs include a plurality of first LEDs arranged within the light-reflecting member and a plurality of second LEDs arranged outside the light-reflecting member. The second LEDs are located corresponding to the concave portions, respectively, whereby light generated by the second LEDs can be reflected by the light-reflecting member to illuminate a large area.