Be able to use this invention, as the illumination of the normal life space it activates the serotonin nervous system of the person, does not rise the noradrenaline level in the blood substantially, decreases attack Characteristic, it designates that the illuminating which possesses the operation which decreases the primary factor which becomes generally known kire ru state is offered as topic, it solves aforementioned topic with the visible light, wavelength 320 or by offering the illuminating which radiates the light which contains the near ultraviolet radiation of 380nm.本発明は、通常の生活空間の照明として使用でき、ヒトのセロトニン神経系を活性化し、血中ノルアドレナリンレベルを実質的に上昇させず、攻撃性を低下させ、いわゆる「キレる」状態になる要因を低減する作用を有する照明装置を提供することを課題とし、可視光線とともに、波長320乃至380nmの近紫外線を含有する光を輻射する照明装置を提供することにより、前記課題を解決する。