A mesh nebulizer includes a main body with a recessed portion opening upward. The nebulizer includes a cap that covers an upper portion of the main body and a replacement element separate from the main body and the cap and detachably mountable in the recessed portion of the main body while being separated from the cap prior to operation of the nebulizer. The replacement element includes a sheet including a mesh portion, a bottom plate portion, and a sidewall portion. When the cap is closed with respect to the main body, the cap presses the upper edge of the sidewall portion of the replacement element toward an edge portion around the recessed portion to position the replacement element with respect to a longitudinal axis direction of the main body.
