Provided is a thin air purification device capable of dramatically improving quietness and securing freedom of installation location of the device and an indoor air purification system provided with the thin air purification device. In an air purification device 1 including a photocatalyst member 2 containing titanium oxide, a plate-like photocatalyst member 2 and a plate-like light emitting portion 3 which irradiates ultraviolet light to the photocatalyst member 2 and includes a plurality of LED elements, The plate-like activated carbon member 4 was arranged in the thickness direction, and at least a part of the outer edge of the photocatalyst member 2, the light emitting portion 3 and the activated carbon member 4 was gripped by the frame 5.
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