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The present invention relates to a phosphor capable of being used for an LED lamp. More specifically, the present invention relates to a garnet-based phosphor having a new composition with improved light-emitting properties while having a reduced rare earth element content, and to a light-emitting device to which the phosphor is applied. The garnet-based phosphor has chemical formula 1, (A_(3-y-x)B_x)(C_(2-2x)D_(2x))(E_(3-3x)F_(3x))O_(12) : Ce_y^(3+).(AA) Example 5(BB) Example 1(CC) Common Lu_3 Al_5 O_12 : Ce^3+COPYRIGHT KIPO 2017