Hydrogen production device using photocatalyst

The invention provides a hydrogen production device using a photocatalyst. The hydrogen gas production device comprises: a water tank in which a hydrogen-side photocatalyst is immersed in water in which a mediator is dispersed, hydrogen gas is generated by irradiation with light, and the mediator is oxidized; a light irradiation unit that irradiates the hydrogen-side photocatalyst with light; a water tank in which an oxygen-side photocatalyst is immersed in water in which the mediator is dispersed, oxygen is generated by irradiation with light, and the mediator is reduced; a light irradiation unit that irradiates the oxygen-side photocatalyst with light; and a water circulation unit that circulates the water in which the mediator is dispersed between the hydrogen-side water tank and the oxygen-side water tank. The light source of the light irradiation unit is a light-emitting diode. 本发明提供一种使用了光催化剂的氢气制造装置。该氢气制造装置具有：在被分散有介体的水中浸渍有氢侧光催化剂并通过光的照射而生成氢气并且使介体被氧化的水槽；向氢侧光催化剂照射光的光照射单元；在被分散有介体的水中浸渍有氧侧光催化剂并通过光的照射而生成氧气并且使介体