A reflective mirror module for being fixed on a housing having a plurality of through holes is provided. The reflective mirror module includes a fixing support, a reflective mirror, a leaf spring, and a plurality of adjusting screws. The fixing support has a plurality of threaded holes. The reflective mirror is disposed on the fixing support, and the leaf spring is disposed between the fixing support and the housing. Moreover, the leaf spring has a plurality of guiding openings, and the positions of the guiding openings and the threaded holes are corresponding to the positions of the through holes. The adjusting screws pass through the through holes and the guiding openings, and are secured in the threaded holes of the fixing support. Through the adjustment of the adjusting screws, the position of the reflective mirror is adjusted precisely. Additionally, a projection apparatus using the reflective mirror module is provided.