Disclosed is an optical element fixing apparatus for fixing a light integration rod and at least one lens. The optical element fixing apparatus comprises a housing and a covering member. The housing is provided with a lens barrel portion and a supporting portion. The lens barrel portion and the supporting portion are integrally formed and are connected with each other, and the lens barrel portion is used for accommodating the lens. The covering member is detachably combined with the supporting portion so as to form an accommodation space between the covering member and the supporting portion, and the accommodation space communicates with the lens barrel portion and accommodates the light integration rod. The optical element fixing apparatus can achieve the effects of fixing the light integration rod with the lens and preventing dust. The invention further brings forward a projection device using the optical element fixing apparatus.