A nebulizer mouthpiece includes a hollow main body and a connecting tube. The main body is a one-piece element, and includes an annular wall defining an inner space and having a middle section, an outlet section, and a storage section connected respectively to two ends of the middle section. The middle section has an inner diameter not smaller than 30 mm. The connecting tube is adapted for interconnecting the middle section and a liquid container, and surrounding a central axis. A distance between the central axis and a distal end of the storage section is not greater than three times the inner diameter. Liquid received in the liquid container is turned into mist and introduced into the inner space through the connecting tube.
