Provided is a small air purification device that can improve the removal performance of acetaldehyde and can be downsized. In the small air purification apparatus 1 using a photocatalyst, the housing 2, the photocatalyst member 3 including titanium oxide disposed in the housing 2, and the photocatalyst member 3 disposed in the housing 2 are irradiated with ultraviolet light. The light emitting unit 4 including a plurality of LED elements 43 and the fan 5 for circulating the air in the housing 2 are included.アセトアルデヒドの除去性能を向上させ、しかも小型化を図ることができる小型空気浄化装置を提供する。光触媒を用いた小型空気浄化装置1において、筐体2と、筐体2内に配置され酸化チタンを含む光触媒部材3と、筐体2内に配置され光触媒部材3に対して紫外光を照射し複数のLED素子43を含む発光部4と、筐体2内の空気を流通させるファン5と、を含むようにした。