An apparatus for treating athlete's foot. The apparatus includes: a main body having at least one body accommodating space part to accommodate a body portion of at least one of a hand and foot; a laser output unit mounted onto the main body, and provided to emit laser light from an upper side to a lower side of the body accommodating space part; and a laser swing unit driven so that the laser output unit swings on the main body, in which the laser output unit includes a first laser diode emitting laser light of a 405 nm wavelength and a second laser diode emitting laser light of a 635 nm wavelength. The apparatus is capable of treating athlete's foot generated on the hand, foot, nails, or toenails by using the light from a laser and/or an LED having a wavelength band useful for treating athlete's foot.