Provided herein is a photocatalytic device having a more compact configuration. A photocatalytic device (100) is provided that includes: a cabinet (110) having a first inlet (114F), and an outlet (114L) formed at a right angle to the first inlet (114F)； a photocatalyst sheet (120) disposed inside the cabinet (110)； a light (130) for applying light to the photocatalyst sheet (120)； and a fan (150) for sending drawn air from the first inlet (114F) to the outlet (114L) through the photocatalyst sheet (120).
