To provide a reading/printing apparatus and a reading apparatus by which the facility with which each unit is assembled and maintained can be significantly improved because steps of fixing and connecting individual units need not be performed in order, a printing apparatus, a control board, and a power supply are disposed inside a housing obtained by integrally forming a base portion serving as a bottom surface, side walls serving as outer side surfaces, and an opening surrounded by the side walls. The reading apparatus, the printing apparatus, the control board, and the power supply are discretely constituted. The housing includes a first housing integrally formed with enough strength to separately fix the base portion, lower portions of the side walls, the reading apparatus, the printing apparatus, the control board, and the power supply, and a second housing covering the opening and integrally forming upper portions of the side walls. The second housing is fixed to the first housing by elastic deformation so as to cover the opening of the first housing.