Abstract: The present invention is directed to a cosmetic case, and relates to a UV sterilizing device of a cosmetic case that can sterilize the surfaces of a cosmetic material and a puff contaminated with sweat, dust, sebum, or bacteria, with a UV lamp. In the UV sterilization device, a lamp device portion (21) is provided on one side of the main body (10), the cosmetic material accommodation space (11) is disposed in a lower portion of a remaining side of the main body (10), the puff support plate (13) is disposed above the cosmetic material accommodation space (11), the puff support plate (13) is formed transparent or translucent, the cosmetic material accommodation space (11) is formed opaque, and UV lamps (20) are mounted to face from a side surface of the lamp device portion (21) to the bottom of the puff support plate (13).