Abstract: A discharge valve is provided at the lower side of a smoke-proof, poison-proof respirator, and an opening part is provided at the front face thereof, a filter vessel being detachably fitted in this opening part. The filter vessel constitutes a cylinder having an outer end wall and an inner end wall, and intake openings are formed in both end walls. Within the filter vessel, in successive order from the outer end wall to the inner end wall, an electrostatic smoke-filtering material, an activated carbon fiber material, and a noble-metal catalyst are arranged. Outside gases are sucked in successively through these elements and, finally passing by an intake valve provided in the filter vessel inner end wall, enter the inner side of the respirator.