A breathing assistance apparatus includes a nasal mask unit, an insert plate, two nasal prongs, a head strap unit, and an intake tube. The nasal mask unit includes a rear wall having an inner surrounding surface defining a prong-receiving hole, a forwardly converging front wall formed with a tube-connecting hole, an insert groove formed in the inner surrounding surface, and two side straps extending respectively from two opposite sides of the rear wall. The front and rear walls define a compartment in fluid communication with the tube-connecting hole and the prong-receiving hole. The insert plate is inserted into the insert groove to thereby be positioned in the prong-receiving hole. Each of the nasal prongs has a nose-engaging end portion, a plate-engaging end portion fitted within the corresponding mounting hole, and a through hole. The head strap unit is connected between the side straps. The intake tube extends into the tube-connecting hole.
